Stephen Hawking as TV critic: 'The Simpsons'

Stephen Hawking, the great theoretical physicist, will make a cameo on "The Big Bang Theory" April 5. And while we're all suitably excited about the prospect of that, it's helpful to point out that Hawking is quite an expert on "The Simpsons" too. He's appeared four times on the classic. 

  Here's one instance...following by a Hawking critique of the show...