Another of those most ingenious inventions ever ! Have you ever needed a third hand, when you are holding a cell phone in your hand, and rummaging through your back pack for your keys, and also have a coffee cup in your hand. (I have similar situations at work. Laptop in hand, note book in the other, and a coffee cup balanced precariously while I try to open a conference room door!).
Why cant we just stick it on the nearest metal surface !! That would be very cool.
Check out how to do this here.
(source: original link from lifehacker).