Three Card Monte
Three cards are displayed. One is red, and the other two are black.
A tradeshow visitor is asked to try and keep track of the red card after the group is flipped over and mixed. No matter how hard they try, the spectators never can find the red card - because it vanishes from the group as soon as the cards are mixed! In its place is found a card with your advertising!
This is a trick that works itself. There is no sleight of hand involved. Can be performed moments after opening the package!
The best part is that trade show visitors who were at your booth will be doing this for their kids. All the while remembering they acquired the trick from you, at the tradeshow.
In this example, your advertising card replaces the 10 of Hearts.
The Magic Block
Coil and Spring