Actually when I answered the question ulna was confirmed but they changed it. Technically, neither is corect since it isn't a bone but the the ulnar nerve that is referred to as "the funny bone".
Funny bone: As in "it tickled my funny bone." When the elbow is bumped, the ulnar nerve running past the elbow is stimulated and produces a strange (funny) electric sensation. See the entire definition of Funny bone
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