Tip of the week: arms

Just a quick one while I'm thinking about it.

Do you walk around holding your arms up? I don't mean with your hands in the air, although that is an amusing image, I mean do you use the muscles in your shoulders to keep your arms "attached"... I bet you do. What would happen if you let those muscles go and let your arms surrender to gravity? 10 bucks says they don't fall off. ;)