What's the difference between the Twin Towers and the Leaning Tower of Pisa?
The Leaning Tower of Pisa has good reflexes.
Reflexes
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Explanation
Experiment
Explain Bear
Listen up, genius. The joke compares the Twin Towers to the Leaning Tower of Pisa. The punchline is that the Leaning Tower of Pisa has "good reflexes." This is funny because it implies the Twin Towers didn't react well when, uh, *something* happened to them. Hint: you probably like to eat crayons.