One of my personal favorites was the AC Milan vs Man Utd at Old Trafford in 06? Finished 3-2 with Rooney scoring in injury time. Back when Kaka was at his best. I also enjoyed the 7-1 thrashing of AS Roma. I was on a Ski trip with my friends and we were at the day lodge eating lunch. I kept telling friend United scored again cause his back was to the tv. He didn't believe after the 3rd time in like 7 minutes. Then there's the last 5 minutes of the 99 final, and the second leg against Juve in 99.
Got to be us vs Barca a couple of years back. It's not often you beat the greatest team ever assembled. But we did it, and we did it with Bendtner playing on the wing.