I didn’t know what a class clown was till I went to a class and realized I was a class clown in kindergarten, and then I woke up from a nightmare.
Class Clown Nightmare
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Explanation
Experiment
Explain Bear
Hey, dummy! The joke is that the person didn't know what a class clown was until they realized they were one in kindergarten. Then, BOOM, it turns out it was all a bad dream! Get it? Probably not, you look like you still watch Caillou.