Remember those ads in the back of magazines and comic books back in the day, promising to show you how to do tricks that will Amaze your family and friends?

Well, fast forward to the 1990s, when magicians Penn & Teller starteealing a few of the old magician's tricks. And then, in 1992, they actually wrote a book of their own, called Penn & teller's how to play with your food.

And that's when I had the chance to meet the talking half of teuo, Penn Jillette.

And something happened during this interview that has never happened before, and has never happened since. Was it something Penn Jillette put together, as a practical joke?