Book on cold reading.
There is a "magician" (he is more than that really) in the UK called Derren Brown. He did an entire show once pretending to be physcic, and was very convincing, enough to have members of the audience in shock/tears etc. Afterwards he explained it was all fake. He's worth looking out for, not sure if he's been exported to the US.
Along with Penn and Teller he's a great debunker.