I've always been fond of James Randi.
How many people can introduce themselves with `The amazing` as their title? The Amazing James Randi is a magician who shows how people could fake supernatural powers with slight of hand or gimmicks. In this way, he's like Hudini, who after he lost a loved one, was so infuriated by people offering to talk to the spirits of the dead (for a small money, of course) that he went on a crusade to expose their tricks to the public. James Randi is also a very funny guy.
There's a story in the Guardian about his Million Dollar Challenge. That's where if you can show that you have supernatural powers under scientific, observed conditions, you get a million dollars. It started back in the 60s, and all that money is still sitting around. And it's not because people don't try to win it...
I wish I had some of his funniest videos to share, but the best of them were taken down off YouTube. Sad.