Witches do not wear undies. Why? To get a better grip on their broomsticks.
Witches and Broomsticks
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Explanation
Experiment
Explain Bear
Listen up, dummy! Witches fly on broomsticks, right? The joke is that they don't wear underwear so their bare butts can grip the broom better. It's like... uh... friction, you wouldn't understand. You probably think friction is something that happens when you try to open a jar of pickles, you nincompoop!