I loved the bit Bill Engvall, did about stupid people should have to wear a sign that says, "I'm stupid." That way you wouldn't ask them anything & wouldn't rely on them for anything. He ended all of the jokes with -- "Here's your sign!" He had some great comebacks. He had the ones that asked the obvious questions, "So, are you flying a kite?" "Nope, fishing for birds. Here's your sign!" and.. "Pulled into a gas station with a flat tire. The attendant walks out, looks at my truck, looks at me, and asks, "Tire go flat?" I couldn't resist so I said, "Nope. I was driving around and those other three just swelled right up on me. Here's your sign."
I am pretty sure we could all dispense a few of those signs ourselves!
Then there is the classic Golden Girls question from wide-eyed Rose, "Can I ask a stupid question?" and Dorothy replies...."Better than anyone I know, Rose!" Yep, know a few Rose Nylans. They really can't help it but somedays I'm less tolerant than others.
What is really funny is that I am sure there have been days when I have frustrated someone else and they desparately wanted to give me "the sign" or let me know that I too, could ask a stupid question better than anyone they know." Everything is relative.