Why can't melons get married?
Because they cantaloupe.
Melon Cantaloupe
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Explanation
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Explain Bear
Listen here, you melonhead. The joke is a pun. "Cantaloupe" sounds like "can't elope." Eloping means running away to get married. So, the joke is saying melons can't get married because they can't run away to do it! You're about as sharp as a marble.