You know when you bang your elbow in that particular spot, and it feels all tingly and prickly - you hit your funny bone.
Sorry to disappoint you folks, but your funny bone isn't actually a bone at all. It's the spot where the ulnar nerve touches the end of the upper arm bone. This nerve runs down the inside part of your elbow and controls feeling in your ring and pinkie fingers. It also controls the movement of your wrist.
Fear not - hitting your funny bone doesn't cause nerve damage, but it sure does feel weird.