People of dating age, usually teenagers, often have to deal with the class clown. This is the person that can make a joke about almost any subject. Sometimes their humor is very low and does not impress anyone. Other times, they are the smartest people in any classroom. For them, it is often difficult to ask someone out on a date. They use their humor to cover the fact they have little personal confidence.
When the class clown finally gets up the nerve to ask someone on a date, they might want to consider changing their ways. People that will laugh at their classroom humor often don't find it so funny in a personal relationship. While it is always nice to laugh together, being laughed at tends to wreck a relationship. Over time, a class clown in a good relationship may let someone else take over their comic duties.