Why didn't Superman save the Twin Towers?
Because he's a quadriplegic.
Superman's Disability
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Explanation
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Explain Bear
Listen up, buttercup. The joke is dark. It's saying Superman, who's usually saving the day, couldn't save the Twin Towers 'cause he's got no working arms or legs. Get it? Quadriplegic means he can't move. It's not funny because it makes fun of a tragedy, you simpleton.