James Randi
From http://www.ted.com/talks/james_randi.html: Legendary skeptic James Randi takes a fatal dose of homeopathic sleeping pills onstage, kicking off a searing 18-minute indictment of irrational beliefs. He throws out a challenge to the world’s psychics: Prove what you do is real, and I’ll give you a million dollars. (No takers yet.) Here is a man who is passionate about finding out what is real and what is not. http://video.ted.com/assets/player/swf/EmbedPlayer.swf