The 5-0 victory over Madrid may be the greatest victory in the eyes of Barca supporters, but neutrals will remember their victory over Chelsea in the Champions League semi-final as the most incredible.
After Chelsea pushed Barca to a 0-0 result at the Camp Nou, the stage was set for an enthralling second leg at Stamford Bridge.
In the ninth minute, Chelsea was given the lead by an incredible strike by Michael Essien.
Throughout the rest of the match, it was a back-and-forth affair.
Barca owned much of the possession, ending with a 71-percent edge, but allowed Chelsea to counter-attack on many occasions.
In the 66th minute, Eric Abidal picked up a red card that seemed to end all hope for the Catalans.
Entering the final moments of the match, each side had had 13 shots.
However, Barca's 14th, a strike from Andres Iniesta, proved to be the difference-maker.
Messi dribbled in the box and picked out Iniesta, square on the edge of the box.
The Spaniard unleashed a curling strike with the outside of his right foot that curled away from Petr Cech and into the top corner of the net.
The celebrations of the Barca players and bench, including Pep's sprint down the touchline, is enough to bring chills.
To add to the glory in the goal, it was Barca's only shot on goal in the entire match, but it drew them level and sent them to the final by virtue of away goals.
Further, it foreshadowed another such game-winner by Iniesta in his World Cup winner for Spain the next year.
Now, for all you Chelsea supporters out there, I'll ask the question: should Barca have even been in this position?
Well, that's up for debate, as numerous legitimate shouts for penalties were turned down by the referee.
In the end, though, that is down to the referee.
Barca made the most of their situation and, in doing so, pulled off one of the most mesmerizing finishes in club football history.