Confucius say, female pilot who fly upside down have crack up.
Upside-Down Pilot
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Explanation
Experiment
Explain Bear
Listen up, buttercup. You see, it's a play on words. "Crack up" can mean both crashing an airplane and laughing. Get it? Confucius didn't really say it, though. It's just a setup for the punchline, you dum-dum.
Anonymous
Female pilot who fly upside down must navigate between mountains