Twisting Arm Illusion

After asking a spectator to copy the action of you putting your hand on the table, you are able to twist your arm a full 360 degrees while others look at you in disbelief

Preparation

Just a along sleeve shirt, everything else is impromptu

Method

THE SECRET MOVE (with the right hand):
On the table, have your fingers pointing towards your body, this may seem a bit uncomfortable, but the effect is well worth it, now, you should have your fingers pointing to the left, now turn your palm up (still having the fingers pointing left) but keep turning the hand over the same way until it is face down again.
With a long sleeve shirt, it looks as if your hand is just turned sideways to the left (in reality, it's twisted 270 degrees to the right).

Performance

Hand on the table or sidewalk.. whenever you want to perform. Tell the layman to do exactly what you're doing and start slowly twisting your arm COUNTERCLOCKWISE.

When your fingers start to point to the left, distract him from what you're doing, say something like "you're doing it wrong, do exactly what i am doing!" or "maybe you should back up a bit to get better view of my directions".

With that, point to his hand or push him away a bit with your other hand, and do "the secret move" while his eyes are concentrated on himself. When you have the secret move done, it's simple matter of him trying to do what you're doing again, but little does he know you are simply untwisting your arm instead of twisting it like himself.

By putting a plastic cup or hard cellophane tucked under your armpit, you can make a bone crunching noise by pressing gently as you twist your arm to add to the effect.