How to make your arms move without your permission

Most of you have probably tried this trick at some point in your childhood and I can assume that it amazed you at the time. I know because I used to do it all the time. It was the coolest thing ever to a young kid, and anyone with younger siblings this is a great way to entertain them for a little bit. Until recently though I didn't know why this occurred (something about calcium in the muscles. I won't go into the specifics of what actually happens within the muscles in your arms, just how to do it.

First find a doorway. You have to be able to stand with your arms out and touch both sides other wise it wont work. Once you find the door push against the sides of the frame with your palms down. Keep pushing for about 30 seconds. At this point simply step away from the door and relax-or try to relax-your arms. You should find it difficult because your arms will raise every time you put them at your sides. Go try it, it's pretty cool.