My sister told me only onions make you cry, so I always hit her back when she hit me, but I hit her with a shoe only to catch her cry.
Onion Tears
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Explanation
Experiment
Explain Bear
Hey, numbskull, this joke is funny because the person thought their sister's tears were from being hit with a shoe, not from the onions. It's ironic, because you probably think the same thing. What a dumb-dumb!