What's the funny joke?

Who is stupid? Who is stupid? A teacher tried to take advantage of her psychology course. When she started the class, she said, "Everyone who thinks they are stupid stands up!" Little Johnny stood up at this moment. The teacher said, "Johnny, do you think you are stupid?" "No, madam, but I hate to see you standing there alone!" English: A teacher is telling her students psychology. "Who thinks he is stupid? Stand up?" She began by saying. Little Johnny stood up. "Do you think you are stupid, little Johnny?" The teacher asked. "No, teacher, I just don't like to see you standing alone." Guest: Give me a hot dog. Waiter: With pleasure. Guest: No, mustard. Guest: A hot dog, please. Attendant: I'm glad. Guest: No, mustard. (Note: with pleasure means "very happy" in English. Customers use happiness as a condiment. No wonder he said he wanted mustard instead of happiness. Second, teacher: Now, class, no matter what I ask, I hope you will answer at once. What's six plus four? Student: Right away! Teacher: Listen, class, whatever I ask, you should answer at once. What is 6+4? Student: Right away.