Ask the viewer for the bill.

Put it in one of several identical envelopes.

Have someone mix the envelopes.

Now, neither the audience, nor you, you know in which particular envelope is the banknote.

Invite any spectator from the audience, for example, a girl.

Ask her to RIP!!! one by one envelopes, leaving only one at the end.

The viewer who lent the bill opens the remaining envelope.

Wow! And his bill was lucky! She is safe and sound!

A wonderful mental trick for a birthday, anniversary, corporate party and other shows.

Very easy to do!!!