'Another Book' by Karrell Fox (Page 67)
Here's another brilliant twist to a an old classic by the foxy one himself.
The original is the trick where you place a coin under a glass that's covered with a sheet of paper.
You know the one.
The effect is the coin will vanish.
The twist is the glass vanishes.
In Karrell's version, neither the coin or the glass vanish, they just get hilariously distorted after being slapped by the magician.