It could be presented as another prediction effect, but you
probably already have plenty of those. Instead, try Jim Gerrish's
version of "thought control," where you apparently take
over the brains of several spectators or even the entire audience
and make them do things in spite of themselves!
This effect requires that you buy a red backed deck of cards
and a blue backed deck of cards from the Dollar Store, or
wherever. It can be performed using jumbo sized decks of cards as
well, for use with larger audiences. It will take you just a few
minutes of preparation and another few minutes to learn the
methods involved. But then you can expect to spend a great deal
of time working on the presentation of this effect of "mind
control" and convince people you can influence their
decisions just with the power of thought.
Buy all 11 articles of this issue (#12)
of the Wizards' Journal $40.00
That's less than $4.00 per article if purchased together!