Your sister is so stupid, she only thinks an onion will make people cry.
So I threw a coconut at her.
Coconut Trauma
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Explanation
Experiment
Explain Bear
Alright, listen up, buttercup. This joke is funny because the sister is so dumb that she thinks only onions can make people cry. The joke teller takes it to the next level by chucking a coconut at her, implying that getting hit by a coconut would definitely make someone cry, ya dig?