[Jaime opens his mouth to argue, but finds that he can't, not knowing what he does about the way magic seems to backfire on nearly everyone who uses it. It's controllable to a certain extent, sure, but that much power is a little terrifying no matter who's using it.]

If that's the way it is where you're from, then why use it? [Jaime gestures towards Rincewind's hat.] Why decide to be a wizard? Why not a... oh, I don't know. An accountant.