You are holding an ordinary coin in your hand.
Pass the coin to your other hand, and place your free hand under the table to catch the coin.
Tap the coin several times on the table. On the last tap, lay your hand down flat on the table.
The coin has disappeared!
Take your other hand out from under the table, and show everyone that you caught the coin!
The secret: when you passed the coin to your other hand, the coin actually remained in the first hand.
Hide the coin in your hand by squeezing it as shown. The hand with the hidden coin is under the table. Now tap the table from above and below at the same time, so your audience never suspects what is happening. Perform the magic trick confidence!