City of Heroes. I never was really into MMOs (and I've never been able to get into one since because most of them are just WoW clones, which I'm not really interested in), but I decided to give a try after seeing how awesome the character creation was and getting an itch to see what I could do with it. Being able to create almost any sort of character that I wanted and the overall superhero setting (which I've always been a fan of, even if I don't read all that many comics) really drew me in, and I spent literally hundreds of hours playing the game, creating new characters, making friends and beating in the faces of bad guys in warehouses for a long time. "I'll just try it for a month," I said to myself, then subsequently played it for 6 years.