My coworker MS asks me at least twice a week whether I'd mind if she murdered somebody -- sometimes the person in question is a customer, sometimes it's a coworker. My general answer is, "Please not while you're on the clock," or in the case of the coworker question, "Please don't today or I'll have to close the store instead of him." But I definitely know the feeling of wanting to kill people slowly, with thumbtacks. *sigh*