The other day at the supermarket i saw a lady asking something to a security guard. I didn't hear the conversation and the lady turned around, put her hand behind back and was cuffed by the guard. I'm sure this is what she asked because both were having fun. The guard positioned her palms out and the back of each hand was almost touching each other, she was trying to move but seemed pretty stuck. The guard released her quickly and she looked happy. But it looked very intriguing to me and to others people, i didn't dared asking the guard i wanted to try too. Is this hand position often used and if it is possible to rotate the hands in less tough position ? Do you know what it feels like to be and why at some point she moved her fingers like she had to ?