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Doctors sometimes yank on your elbow and get a tingling jolt down to your fingers, even though nothing there is actually bone.
The 'funny bone' is actually the ulnar nerve, not a bone at all, running close to the surface of the skin right at the elbow. Because it sits so close to the surface with little cushioning, bumping that spot sends a sudden, tingling jolt of sensation shooting down into the forearm and fingers, exactly like an electric shock.
A small bone fragment and a tendon would not produce that distinctive tingling, electric feeling, since nerves are what carry sensory signals, bones and tendons don't transmit that kind of jolt when bumped the way an exposed nerve does.
The nickname likely plays on a pun, since the sensation feels odd and 'funny,' and the nerve runs right alongside the humerus, the bone in the upper arm, whose name sounds almost like 'humorous.'
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