Oh there are so many. Mine was that time he got traded to the New York Mets. Remember that? Classic.
I know a lot of you are gonna talk about that game where he went 1-4 with a stand-up double in a meaningless October match-up against the A's, and that was really memorable, granted. And, hey, I creamed over his running catch against the Royals' Desi Relaford in the June 2007 as much as the next guy. But I really think it's the trade.