There is another question I hear frequently that prompts a similar reaction in me. I usually hear this when I'm head and shoulders into a job, or half stretched out on the floor trying to get an accurate count on how many hundreds of bottles of Suave shampoo are on the shelf. "Excuse me, but, do you work here?" I really really really want to hit them with the snappy comeback "No. I just do this purely for entertainment purposes." Or "Of course I do, you idiot, whaddya think?"