double-jointed

i know a guy who is "double-jointed" - he demonstrates his ability to bend his arms at odd angles for everybody, it is creepy. if i were double-jointed, i would keep it a secret. no one would ever know it unless you and i were trapped in a cage or straight-jackets being lowered into a vat of acid and the only way out was for me to bend my arms "funny" to reach and disable the locking mechanism thereby enabling us to escape from our perilous situation, and even then, i'm not sure i would do it. and that should be all you need to know about me.