This stuff doesn't happen by accident, you know. The first time Lionel Messi stuck the ball through Thibaut Courtois's legs from a seemingly impossible angle it was possible to fool yourself that, well, he might have got a little fortunate there.
The second time, there could be no doubt. Messi shoots from places that no other footballer would, he is capable of targeting areas of the goal, or of a person, with a precision that is quite breathtaking.
It is remarkable that Barcelona ever lose a game with a player of his talent on tap, remarkable that he doesn't just score several this way each time he plays, considering he seems able to pass through the thigh gap at will.
Lionel Messi put Barcelona ahead after just three minutes at the Nou Camp against Chelsea with a finish from a tight angle
Ousmane Dembele smashed in his first Barca goal to put them two ahead inside 20 minutes and in control of the tie
Messi killed the game midway through the second half with his 100th Champions League goal - again through Courtois's legs
Chelsea played well, but made crucial errors which saw them dumped out of Europe at the last 16 stage of the competition
The night belonged to Messi, and he even got a hug of congratulations from the opposition manager at the final whistle
Barcelona fans wave flags as the majority of the 97,000 crowd celebrate reaching the quarter finals of the Champions League
MATCH FACTS, LINE-UPS AND MATCH ZONE
BARCELONA (4-4-2):Ter Stegen; Roberto, Pique, Umtiti, Alba; Dembele (Aleix Vidal 66), Rakitic, Busquets (Andre Gomes 61), Iniesta (Paulinho 55); Messi, Suarez
Subs not used: Cillessen, Digne, Vermaelen, Alcacer
Goals: Messi 3, 64, Dembele 20
Booked: Roberto 21
CHELSEA (3-4-3): Courtois; Azpilicueta, Christensen, Rudiger; Moses (Zappacosta 67), Fabregas, Kante, Alonso; Willian, Giroud (Morata 67), Hazard (Pedro 82)
Subs not used: Caballero, Cahill, Emerson, Bakayoko
Booked: Willian 45, Giroud 50
Referee: Damir Skomina
Barcelona's passing play took them from one side of the Nou Camp pitch to the other, before Lionel Messi was laid off by Luis Suarez to score through Thibaut Courtois' legs. For more stats and facts, visit our exclusive MATCH ZONE service by clicking here.
Chelsea manager Antonio Conte, his Champions League ambitions laid to waste, walked off having given Messi an affectionate cuddle. That might not have gone down well with those who demand pure tribalism but, as a football man, we understand. Sometimes you just have to say well done.
Alan Shearer thinks we are witnesses to the greatest footballer there has ever been — on nights like this he makes a very appealing case.
Chelsea weren't bad here, whatever the scoreline might suggest. They were better than Manchester United against Sevilla on Tuesday and certainly not embarrassed.
They just made mistakes. And every time they did, Barcelona scored. Every time, without fail, across two legs.
Andreas Christensen, Courtois, Cesc Fabregas, Cesar Azpilicueta — every Barcelona goal had a different abetter from Chelsea's ranks.
The experienced ones, on Wednesday night, too. Veterans of World Cup finals and huge European games. They each committed the cardinal sin. If you can't give a sucker an even break, you certainly can't give three to a team like Barcelona. They are brutal in making it count, clinical in the finish in a way Chelsea were not.
Messi benefited from a fortuitous deflection off a Chelsea defender in the box, however his finish was perfectly placed
Courtois looked to have the angle covered, however he left his legs too wide and Messi was able to slot the finish through
Messi, days after the birth of his third child, was celebrating again after he finished off a typical Barcelona passing move
Messi salutes the Barcelona fans after scoring his early goal, as Chelsea were unable to cope with his creative talents
The home support welcomed back their king - who missed the weekend game for his child's birth - with this huge banner
And in Messi they have a player who scores goals from angles the Greek giants of trigonometry didn't know had been contemplated. There is no sliver of the penalty area from which the goal can be made safe. That is the only mitigation in Courtois's defence.
What was said before this tie? That Chelsea are Messi's bogey team and he doesn't score against them. Seems to have put that one to bed, don't you think?
Barcelona scored four over the two legs, Messi got three and made the other. There wouldn't have been that much between the teams otherwise. It is even possible to imagine that if Chelsea had Messi, they might have won.
As it was, they hit a post, the bar, and had a decent penalty shout rejected on Wednesday night. Had those three gone in, they would have progressed.
That such an outcome always seemed a forlorn hope is due largely to the timing of Barcelona's goals. They were one up after two minutes and eight seconds, two ahead on 20 minutes and three clear just after the hour, by which time all hope was lost.
There were moments, even 2-0 down, when it was possible to see Chelsea pulling one back and giving the locals a scare, considering 2-2 would have sent them through on away goals.
Courtois is left dejected and Dembele jubilant as a clinical Barcelona scored with their first two shots of the evening
Courtois got a hand to the £135million Frenchman's powerful strike, however could only deflect it into the top corner
Messi was the creator, beating two Chelsea defenders before playing a perfect through pass for Dembele to score
Yet each time there was a smidgeon of optimism in the air, so Chelsea stumbled, Barcelona capitalised and extended their lead.
Had Chelsea got back into the game, one imagines Messi might have just taken it away from them again, because he was in that kind of mood.
That Barcelona scored from the first attack of the match was a huge slap in the face. Conte will have sent his players out with the instruction to keep it tight, to make Barcelona play through their ranks, to frustrate them and hit on the counter. Bang went that plan, less than three minutes in.
Messi tried to play a one-two with Ousmane Dembele which Marcos Alonso cut out. Unfortunately, his interception only sent the ball into the path of Luis Suarez who reacted with typically wonderful improvisational skills, thinking fast to divert it to Messi with an instinctive backheel.
It was brilliant, street-inspired football but it would have come to nothing had Courtois done his job and Messi been less than a genius.
It was Messi's night through and through, as he made it 3-0 after the hour with a low, powerfully struck left footed finish
Victor Moses is unable to cope with Messi as Barcelona again unpicked the Chelsea defence to reach the quarter finals
Marcos Alonso hit the post with a free kick just before half time as Chelsea tried desperately to get back in the game
Despite going two behind, Chelsea started the game well - here Eden Hazard runs with the ball at defender Sergi Roberto
Olivier Giroud and Antonio Rudiger both go for a shot, with the ball being sliced wide - but the offside flag was up anyway
Giroud and Rudiger can only look at each other after another chance goes begging, as Chelsea were left frustrated
GRAHAM POLL ON THE ALONSO INCIDENT
Referee Damir Skomina had an excellent game in the Nou Camp, highlighted by his excellent reading of the 'penalty' incident for Chelsea just before the hour.
Marcos Alonso was brilliantly found in the area after a series of passes but instead of pushing towards goal and shooting he looked for contact from Gerard Pique.
Looking at replays of the incident, some Chelsea sympathisers saw a foul but in reality Alonso was fortunate not to be cautioned for simulation. The World Cup-bound Slovenian official was under great pressure from the partisan crowd but was even-handed throughout.
He was at a horribly tight angle on the right, one that only he turns into goals. His shot travelled through Courtois's legs and into the net. He shouldn't have been beaten like that, he shouldn't have been beaten from there, he was slow down and awkward. Yet, in his defence, this was Messi.
Real Madrid have to find a way of stopping Messi, though, and if they were watching, the display would have done Courtois few favours. David de Gea looks so much the better option right now. Maybe he is thinking that about Madrid, too.
To their credit, Chelsea responded well and immediately. Willian went close twice, yet mistake number two changed the complexion of Chelsea's task. Fabregas gave the ball away in midfield to the player who should never be handed presents.
Messi's break was stunning. He rode two Chelsea tackles and then somehow spotted Dembele in a wide position on the opposite side of the field, yet slightly behind him. It's like he has wing mirrors.
Dembele took a touch and lashed the ball across Courtois into the far corner. He got a hand to it, but to no effect. It is to Chelsea's credit that they remained competitive for so long in the circumstances.
Had a third goal gone in from Suarez after 28 minutes, it could have got away from them, but Chelsea stayed bold.
Cesc Fabregas and N'Golo Kante were also left to argue after getting in each other's way to spurn an opportunity
Gerard Pique almost made it 3-0 by getting on the end of a whipped Messi free kick, however Courtois was able to gather
Courtois was forced into another save from Suarez early in the second half, after he had given the ball away with a poor pass
Chelsea felt they should have had a penalty when Alonso went down under pressure from Pique, but nothing was given
Giroud screams at referee Damir Skomina after he refused to award a penalty - the striker got booked for dissent
Alonso hit the outside of the right post with a free-kick from 25 yards, then hit the turf under pressure from Gerard Pique in the second half. A penalty? There was certainly a tug on his arm, but Alonso fell cheaply when he was in a good position to score.
By the time Antonio Rudiger hit the bar late on, the game was long over. Barcelona's third of the night was an error by Azpilicueta, who gave the ball to Suarez, who found Messi and — well, let's just say the usual happened.
Approaching the goal at an angle from which the world and his wife would have passed, Messi shot.
He did so with such ferocity and accuracy, with such acceleration of body and mind, that Courtois looked to have turned his back on it. He hadn't. He was just glancing behind to see where it had gone, as it appeared to have passed through him.
Maybe it did. Maybe Messi is magic.
It would make as much sense as any of those other things he does with the ball.
Barcelona nearly got a fourth, however Paulinho's header was brilliant tipped away by Courtois in the final few minutes
Chelsea struck the woodwork for the second time in the dying seconds, when Antonio Rudiger headed a corner onto the bar
Chelsea manager Antonio Conte and his Barcelona counterpart Ernesto Valverde issue instructions from the touchline