The body part commonly referred to as the "funny bone" is not a bone at all but rather the ulnar nerve, which runs along the inner part of the elbow. When this nerve is bumped against the bony prominence of the elbow, it can create a tingling or funny sensation down the arm and into the hand. This peculiar feeling might be amusing, hence the term "funny bone." However, it can also be quite uncomfortable for some people. The ulnar nerve is crucial for the sensation and movement of the forearm and hand.