Star Wars Galaxies..aside from the gay combat update, it was the best game and probably, in my list, a great runner up to WoW. I love tricking the noobs by saying "I'll make you Terra Kassi pants for free!" and I give'em a g-string....yes its slightly disturbing but funny as hell.
Also, the illogic is great, if you are a Master Scout you can take out a giant building as a "portable campsite".
I was chased by an R2-D2 at 80 miles per hour and it was shooting lightning bolts at me. Rich humour.