I work in a grocery store, and I've received more than my fair share of dumb questions. Here are a few examples.
1. A man walks up to the lobster tank and sees the lobsters swimming around lively in the tank. He calls me over and asks me: "Are these lobsters fresh?"
2. A lady comes up to me with a chicken breast marinated in lemon and pepper seasoning. She asks: "This looks dirty. Should I rinse it off before I cook it?"
3. I answered the phone one day. "Seafood Department". The guy on the other end asks: "Yes. Do you sell fish?"
There are a lot more, but I've gotten so many, I can't possibly remember them all.