Keith Barry the Impaler.
One of the cups covers a 4″ sharp metal spike pointing up.
TED just posted the video here on fB, victimizing me in the finale at minute 15: http://www.ted.com/talks/keith_barry_does_brain_magic?awesm=on.ted.com_ptqw&utm_medium=on.ted.com-none&utm_campaign=&utm_source=direct-on.ted.com&share=19b0bb76ff&utm_content=roadrunner-rrshorturl#t-874377
I still don’t know how he did it (I think I know how he could know where the metal spike lies, but how did he guide my participation?)
He brought people on stage for various tricks, but interestingly, he asked for a male volunteer before starting this one. So, I wonder if women are less likely to go along with his trick to the end, or if the audience’s emotional response would be different (for me, the audience just cheered him on)
Full video: http://on.ted.com/ptqw
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