Found 2 comments on HN
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...

baha_man · 2008-04-30 · Original thread
Derren Brown's book, 'Tricks of the Mind', has an interesting section on memory:

http://www.amazon.com/Tricks-Mind-Derren-Brown/dp/1905026358...

He discusses the 'loci system', 'memory palaces', and 'peg system':

http://en.wikipedia.org/wiki/Method_of_loci

http://en.wikipedia.org/wiki/Mnemonic_peg_system

I haven't tried them out myself yet.

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