Magic Trick Moving Thumb

Effect:
You remove your thumb from your hand and show it to the audience, before restoring
it back to normal.
Method:
You use the thumb of the right hand to imitate the left-hand thumb.
Performance:
Hold out your left hand with the palm towards you, fingers stretched out and have the
thumb sticking upwards.
Bring your right hand to your left and wrap it around the left thumb, holding it in a
fist.

Now rotate the right hand, releasing the grip on the left thumb.
Simultaneously bring the left thumb into the palm of the left hand like so:

Curl the right thumb in-between the index and ring fingers of the right hand so that
the tip is sticking out.

So it should look like this:

This should all be performed while the hand is rotating, so that once it has turned 180
degrees the right fist is resting on the top of the left hand. Like so:

To the spectator, you have simply taken a grip of the left hand thumb which has
remained in sight the entire time.
You can now shift the thumb down the hand, and down the arm itself.

If desired, you can also pretend to pull the thumb off the hand.

To restore, simply bring the thumb back to its original position taking the place of the
left thumb, and reverse the rotation bringing the left thumb back up into the right fist.
Now slowly open the right hand to show the left thumb inside, which helps the
illusion that it was the left thumb all-along.