Someone mentioned Don Rickles and i believe
him to be the funniest guest ever on any show.
Never be another like him for sure.
Here's a few Carnac jokes i pulled off a website
about "Johnny Carson and Carnac jokes"
Answer: Touchback.
Question: What's the smart thing to do if a Dallas Cowgirl touches you?

Answer: Yassir Arafat.
Question: What's the sound made when Dolly Parton removes her bra?

Answer: Catch-22.
Question: What do the Los Angeles Dodgers do with 100 pop flies.

Answer: Do-whacka-do.
Question: What do you look for when you're hunting do-whackas?

Answer: Bobby Orr, Bobby Hull, Ed Sullivan.
Question: Name two hockey players and a hockey puck

Chuck

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They hold no Quarter