My main (to let you know how long it's been since I really played) is/was an Undead Warlock, changed to a Blood Elf eventually, and I mostly did PvP.
One of the funnier moments was as I was waiting for the zeppelin at Undercity to take off and head to Ogrimmar, I accepted a duel. Eventually the zeppelin departed, and this guy didn't have much health left on him, and the fear spell he was under made him run off the zeppelin (still in Terrisfall Glade) and plummet to his death. His friend ran to the side of the zeppelin, and said something about "my friend....you killed him," and then he started laughing. Another funny is real corpse camping, when you kill a player in the environment, and make a campfire to sit around waiting for the player to get back to their corpse and respawn. And then there was a battleground once, Alterac Valley, that I started and played on until I had to leave for work, and then when I logged on after work (about 9 hours later) and joined AV I was put back into the same game I logged off from.