18th birthday - "Stutter" by Joe feat. Mystikal (don't have a clue what this is)
21st birthday - "Yeah" by Usher feat. Lil Jon & Ludacris (I hate, hate, HATE this song!!!!!!!!! Funny, the song that every shitty club I've ever been to plays constantly first got popular around my 21st)
HS Graduation - "All For You" by Janet Jackson (don't know this one offhand)
College Graduation - "Bad Day" by Daniel Powter (garbage)
So, I guess the lesson is that I'm not down with what's popular at any given time. Oh, and on the day I was born, it was "Billie Jean" by MJ, which isn't exactly great, but much better than any of this other garbage.