Not sure if you’re just being humorous using the Jeopardy format or if you in reality don’t know who he is. If you don’t, he is the longest winning champion in Jeopardy and second biggest prize winner. Some other champ defeated him in a Jeopardy special where champs face each other and won a big prize which made him the bigger winner overall in spite of the shorter streak. My understanding is that the other guy quit while he was ahead, while Jennings kept coming back till he was first defeated. Interestingly, he’s one of our relatively few Democrats. But he’s pretty darn smart in spite of that lapse in judgment 😉 I’ll update the OP.

http://en.wikipedia.org/wiki/Ken_Jennings

By the way, I hope my comment about Johnny and Pufnstuf wasn’t taken as rude. I really couldn’t figure out the show (from my research, that doesn’t look like the real H. R. Pufnstuf), and there is no character or actor on the show named Johnny