Effect:
You display some coins of different value on the table. Ask your volunteer to hold one of them in front of his/her forehead while you turn away, then ask them to place it back on the table, in the normal position.You turn back, touch the coins one by one and correctly name which coin they held a moment ago.

Steps:
1. Display 3-10 different coins.

2. Turn away from your spectator.

3. Ask him/her to hold one of the coin in front of  his/her forehead.

4. Talk to your spectator, tell them that you can't really know which coin they hold.

5. Ask him/her to place the coin back on the table, at the normal position.

6. Turn back, touch the coins one by one. You will feel one of the coins is warmer than the others, that's the spectator's selection. It is because that coin was held by the volunteer for a few seconds a moment ago, the heat energy in his/her hand "warm up" the coin.

Tip:
Show this trick in a cold place.