A card is selected from a deck of playing cards. This card is signed by a spectator and then placed underneath a glass. Now a blank card with a signature is shown. This card is folded and then it visually penetrates the entire deck of cards and ends up inside the glass. The signature of the card is still there, but when it is unfolded, the card appears to be the spectators, with there signature!
This effect requires some gimmicks to be made. The tutorial video explains in detail how to easily create these gimmicks with common household items.