The Double Undercut
The magician cuts the deck multiple times without changing the order of the cards.
How It's Done
Hold the deck face down with the fingertips of your right hand, with your palm over the cards. Grab the bottom half of the deck with your left hand and place it on top of the pack in your right hand, while holding a break with your right thumb. Grab the bottom fourth of the deck with your left hand (the bottom half of the cards under the break) and place it on top of the deck. Finally grab the rest of what is under the thumb break and bring it to the top, the cards are now in their original positions.