Funny Bone

A pun on the word humerus. It is the inner condyle of the humerus; or, to speak untechnically, the knob, or enlarged end of the bone terminating where the ulnar nerve is exposed at the elbow; the crazy bone. A knock on this bone at the elbow produces a painful sensation.

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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