My mother-in-law would have been on one of the planes that crashed on 9/11.
Had I known in advance, I would have bought her the ticket.
9/11 Ticket for the Mother-in-Law
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Explanation
Explain Bear
Listen up, genius! This joke is funny because it implies that the person dislikes their mother-in-law so much that they would have willingly put her on a plane that crashed during 9/11. It's dark, and the humor comes from the unexpected and morbid twist.