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Heart Stop!
http://www.themagicteacher.com/articles/256/1/Heart-Stop/Page1.html
Noah Sturis
My name is Noah Reinert Sturis. I'm 13 years old. I'm half American and half Dane. I have done magic for about 2 years now, so can do some advanced stuff, but I can't do that many flourishes. (Belive me! I've tried!) 
By Noah Sturis
Published on 05/28/2007
 
Make a spectator feel your pulse on your arm. Suddenly your pulse drops and then stops completely.

Heart Stop
Effect: A spectator feels your pulse on your arm. Suddenly your pulse drops and then stops completely.

Secret: A tennis ball (You need this. If not experiment with different things untill you get the effect)

1. Take the tennis ball and put it under your shirt in your armpit. (Make sure that the spectator doesn't see it)

2. Make the Spectator feel your pulse on your arm like this:

Im not sure that you can do the bottom one, but you can try it if your want.

3. Squeze the tennis ball (Thats under your armpit), when you want your heart to stop and release when you want your heart to start again.

Enjoy!!!