Barcelona won 3-1 against Arsenal, knocking the reds out of the Champions League with 4-3 on aggregate.
Defending a 2-1 lead a terrible back-heel from Cesc Fabregas set-up Lionel Messi for Barca's first.
But soon after the start of the second half Arsenal were back on terms after Busquets headed into his own net.
Robin Van Persie got a second yellow card for kicking the ball away after the referee blew his whistle. Van Persie claimed he never heard it.
Xavi then made it 3-3 on aggregate and then Messi sent Barcelona into the last 8 with a penalty.
Arsene Wenger said: "We were beaten by a terrific side, the best in Europe."