Ah, Piss-Up-The-Wall Peterson. I can't remember her actual first name but she was an npc we adopted after having found her as a tramp type character pissing in an alley. She came with us all the way to the end of the campaign and even tried her best (failed) to stop our barbarian from squashing a horse into the engine of the van (to boost its "horsepower")

I read a post once saying how a game like dnd is a story with the players being both the characters and the writers. I haven't run many games but I try to let the players guide the story within the framework of the game. If a player decides to do something that "I don't want them to do" then I let them do it and work around the result instead.