Cut a quarter into two pieces, and then restore them into a single coin. They may be borrowed, and it is not hidden from view or switched at any time!
Slice a quarter into two pieces! A borrowed quarter is pushed against the blade of a sword. The coin is suddenly cut into two pieces, which fall separately into the bottom of the case. The quarter is clearly in two pieces, even when viewed from any angle. When the magician lifts up the two pieces, they join together to form a single coin once again.