Burmese Change is one of the smartest tricks I've ever seen.
Spectator signs on the card and puts it in to the deck.
The magician takes a random card and the card changes two times in to different cards...
And the third change is when a random card changes in to the card signed by spectator!
After the trick, the card can be given to the spectator as a souvenir.
Additional supplies may need to be purchased in order to perform this effect.