When the school shooter enters the classroom and it's the quiet kid's dad.
Quiet Kid's Dad
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Explanation
Experiment
Explain Bear
Alright listen up, dummy. So the joke is that the school shooter ends up being the dad of the quiet kid. It's funny because the quiet kid is always SUSPECTED of being the school shooter, but SURPRISE, it's the dad! Get it? You probably don't, since you are so dumb.