I had an interviewer who thought he was the only person using the round manhole cover question. When he asked it I instantly answered "so they don't fall in the

I had an interviewer who thought he was the only person using the round manhole cover question. When he asked it I instantly answered "so they don't fall in the hole" and he freaked out. "Wow, you are so smart, I've never had anyone answer that question so quickly!" I didn't have the heart to tell him its a cliche.