Through my tendency to overuse the Thieves Guild in various plots, one of my players' characters became a terror of the underworld. This or that organization would attempt to capture her, only to have its members maimed or killed, and their headquarters burned to the ground. In the group it quickly became the running joke (and after that an in game fact) that the Guild circulated descriptions of her character with the note attached "For the love of all that's holy, don't start any trouble with her!"