While there's no question that Dr. Oz promotes some wacky products on his show, he's certainly not the first person to turn the public's trust into a cash machine.

This week, we'll talk about a literal snake oil salesman -- the shifty-eyed, razzle-dazzle pitchman behind Stanley Clark's Snake Oil Liniment, and Senator Dudley Leblanc -- mastermind of Hadacol, and, of course, the magical Dr. Oz himself.