The scary card trick by Jim Pace. This is the trick that makes them scream.  Four blank cards are counted onto a spectator's palm, they're counted again and pictures of a Spider's Wen appear on the faces of the cards.  To conclude they're asked to wave a hand over the cards - as they do this they discover a large plastic spider on the back of their hand.  It was undetectable, as it's loaded way ahead.  A scary trick that should only be performed at the right time and place, when it is, the response is unprecedented.