Ron Frost's Split Decision
A performer shows a matching set of cards
that are cut in half. The magician then separates
the halves into two face down groups. Next,
our wonderworker shows a prediction of one
of the cards and places it visibly to one
side in a wallet.
A person freely chooses (no force) a half card from one of the half card
sets. Next, the person matches his chosen half with its mate from the other
set. Finally, the performer reveals that he correctly predicted the matched
set! This can be repeated with different cards every time.