This is a common, but stupid job interview question. It was posed to the Democratic Presidential candidates at last night's debate. Jeff the Baptist on the question:
Have you ever had an interview for a position you realized you don't want? If that ever happens again, I'm just going to make something up and see what the interviewer does. "My biggest fault? I'm a pedophile. But I only indulge myself on my regular trips to Thailand. I figure I'm only there to smuggle heroine back to the States so it doesn't really count." Or "I'm incredibly flatulent, especially in enclosed spaces like elevators and interview offices. Must be my diet or something. Oh, excuse me."