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They'll say AMAZING! UNBELIEVABLE!
You borrow a $1, $10, or higher amount dollar bill and have your friend mark it. He can mark it with his initials, phone number or any special text so if he sees the bill later, he knows it is the same bill. You now fold the bill, secure it with a rubber band, and place it under a hanky. This hanky is given to the spectator.
You now display a small brass tube with a threaded lid, a brass bar running through it with a locked padlock. The padlocked tube is given to your friend to hold in his free hand and the key he holds in his other hand.
ABRACADABRA! You snatch the hanky from the spectator's hand and their dollar bill has vanished! Your friend removes the locking bar and unscrews the lid to the brass tube which he has been holding throughout the routine. Inside he finds his SAME, VANISHED marked or signed bill! Amazing! OUR BILL TUBE CAN WITHSTAND CLOSE EXAMINATION WITHOUT ANY CLUE AS TO HOW YOU DID IT!
Polished brass, machined to perfection.