The first character I've ever made was rogue back in the very, very early days of vanilla. Sure, this character has switched factions, changed servers, and altered appearance more times than I can count, but I've never really been able to play and enjoy another class like I do the rogue. It just feels so unnatural.
I did find a video (I believe it was around 2008) that made me excited to be a rogue again. It is what got me back into World of Warcraft after a long hiatus: http://www.youtube.com/watch?v=vYABYMIAKVI (Note: I didn't make this video.)