Hell yeah. I always find it amusing how frequently people take me seriously when I'm trolling. Did no one ever consider the possibility that I'm a dirty liar? Of course, maybe the people I'm trolling actually know I'm a troll and are trolling me back. But probably not.
Most recently I made an inappropriately named character on the ftp mmo Requiem: Memento Mori. I spent most of my time hitting on female avatars (most of whom we're men, I'm sure). By hitting on, I mean that I kept asking to fondle their chests. Then I joined a guild and, judging by their inability to spell their own name correctly, spent some time trying to guess what sorts of hobbies n00bs like them would enjoy and then writing about them. Apparently I'm into rap and street racing. Then I go afk in theme pvp battles, but not really because instead of fighting I spend my time sitting on my butt and typing "hurry up and win, u nubs" into the party chat. Then when I finish pvp I tell my guild how I pwned everyone.
Basically the total opposite of me in every way, but I was amazed at how well I pegged them. My trolling is nothing, however, compared to my 32-year-old brother who also joined that guild as a 15-year-old girl who says things like "me too scared to fight" to get dudes to level him while he goes afk.
Usually trolling is too much work, though, so I have to be in a special kind of mood to do it. The internet does a good job of trolling itself anyway.