In Derren Brown's excellent Tricks of the Mind[1], he mentions the lengths that audiences are willing to go. In one example, he says something about "this coin

In Derren Brown's excellent Tricks of the Mind[1], he mentions the lengths that audiences are willing to go. In one example, he says something about "this coin in my hand" while holding his hand up near his face for a moment, index finger and thumb spaced to the approximate distance of a coin, yet there's not actually a coin there, just empty space! Afterward, people will swear that there was a coin in his hand, going so far as to describe what sort of coin it was. [1] http://www.amazon.com/Tricks-Mind-DERREN-BROWN/dp/1905026358/ http://www.amazon.com/Tricks-Mind-DERREN-BROWN/dp/1905026358...