I have been using this effect for almost 50 years and it never fails to mystify and amuse.
The performer makes a prediction that two cards will be selected at random His prediction is placed in full view. Two cards are selected from a deck of cards and retained by the spectators. The predictions are shown but they are not what everyone expected. To the amazement of all, the prediction IS correct but in a very unusual way that never fails to get a laugh… and sometimes a groan.
You are supplied with the special deck of bicycle cards plus the prediction cards and detailed instructions.