It just doesn't get any more direct than this!
Four Jokers are displayed, one is face down. You explain that when the other Jokers see one face down they like to follow.
And with that, TWO cards are now seen to be face down. You offer to turn a card face down openly, and then the unexpected happens take a look:
NFW will blow your audience away!
Easy to do!
You receive the special cards and a vinyl holder to keep them in. Full instructions are included.