There was a stand-up comedian notorious for his practical jokes. So one day, during a performance, he asked that anyone from the audience come on to the stage. A blond girl walked up. He asked her, ""Can you tell us a joke?"". The blond girl was well aware that the comedian was trying to pull some prank. She had decided that, no matter what, she would not fall for any of his tricks. So she took the mike from him, and proudly announced to the audience: ""I'm not stupid!"". It took a whole minute for the uproar of laughter to settle.