Diddy Kong Racing 64 was an amazing game, or at least to a five-year-old. You could fly backwards, you could have (actually pretty lame, thinking back on it) pick-ups, which were pretty cool at the time, and I think you could play as Banjo in the game, which is of course awesome.
Half Life 2
Mother 3
James Bond: Nightfire
Legend of Zelda: Wind Waker
Pokemon Crystal
I'm probably forgetting some game that I cherished, but I still love these games anyways. I know Nightfire is just your average FPS, but me and my friends played its multiplayer so much it HAS to be in top 5.
More of a repeated geeky action, but in Metroid Prime, whenever I beat a boss, I would do this weird anime fist of victory thing. It didn't matter who was in my room at the time.