Found Derren Brown's web site. Reminds me of the Amazing Randi.

By the way, from Wikipedia, the search on Barnum effect brings up the 1948 demonstration of this effect by Bertram Forer. You can see a real audio demonstration of the effect using horoscopes.

http://en.wikipedia.org/wiki/Barnum_effect Click here

"The Forer effect (also called personal validation fallacy or the Barnum effect after P. T. Barnum) is the observation that individuals will give high accuracy ratings to descriptions of their personality that supposedly are tailored specifically for them, but are in fact vague and general enough to apply to a wide range of people. The Forer effect can provide a partial explanation for the widespread acceptance of some pseudosciences, such as astrology, graphology and fortune telling."