Why don't crabs share?
Because they're shellfish.
Because they're shellfish.
"Shellfish" sounds like "selfish" — and crabs are literally shellfish (crustaceans with shells). They don't share because they're selfish, and they're selfish because they're shellfish. The wordplay is phonetically near-perfect, and the personality trait fits the animal category so well it feels like destiny.
Ask the setup with mild frustration, like you've personally tried to get a crab to share and failed. Say "shellfish" with an accusatory tone.
Perfect for:
There's a psychological reason bad jokes make us laugh: it's called "benign violation theory." The joke violates our expectations of humor, but in a harmless way, creating a unique kind of amusement.
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