Definitely the 7-1 against Roma. There have been moments of ecstasy in other matches, but there hasn't been any other game where I have simply been so overwhelmingly happy throughout the entire match. Even thinking back to it puts a smile on my face. There was magic in the air that night.
Carrick's second goal in that match has always been one of my favourite goals. There wasn't any real importance to it, but it was just an incredibly clean hit.
I also have to mention the 5-3 against Spurs. I was watching it with my old man (a Spurs supporter) who was giving me a bit of shit at halftime when they were winning 3-0. I'll always remember the instant we scored our second goal I looked at him, he looked at me, and I just smiled. We may have still been losing 2-3, but we both knew Utd were going to win that match.