IdiomThe AbsurdEnglish

have bats in one's belfry

Meaning: Harmlessly crazy or eccentric.

Example: “The old man who talks to pigeons may have bats in his belfry, but he's kind.”

Origin: A belfry is the tower of a church where the bell hangs, and is analogous to one's head. If a person has room for bats in his head, his head is full of space rather than brains.

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