Hm, worst thing I've probably put to paper is having my protagonist mutilate a prisoner by chopping his balls off. I mean, he was the abusive brother of one of the protagonist's comrades but still.
I've toyed with the idea of some worse stuff as part of various characters backstories, but never really got a chance to go into details about them in the actual story.
I can't lock threads on my own, but I am a master with a ban hammer. Thread has been reported and will be locked. I think we've gotten all we're going to get out of this one.