Dude, has anyone made a joke about small foreheads? Oh wait... they would be nonexistent.
Small Foreheads
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Explanation
Experiment
Explain Bear
Alright listen up, because you ain't too bright. The joke is that if someone had a really small forehead, it's like saying they have no forehead at all. It's funny because it's an exaggeration, and also because your head is empty.