I've been looking all through this site but no answer to my search question? Who originally started the phrase "sit on it"? I thought it was the Fonz but I can't find anything

It was fonzie!

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See ya~The T
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Butler-Your Coat?

Fonz-Yeah it's my coat, are those your pants?
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Joanie was the first to say it.

The first person to say "sit on it" was Joanie Lousie Cuningham. The first time she siad it was to Ralph Malph in Episode 40. In this episode, it is also the first time the song "Happy Days" was used in the opening credits, and the first episode with Fonzie living in the apartment over the Cuningham's house.

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"You can wake up now, the universe has ended"
-Jim Stark (James Dean)
"Rebel Without a Cause"
1955

"Teenagers are like airplanes: You only hear about the ones that crash"
-Dwight Eisenhower

"I see nothing wrong with giving Robert some legal experence as Attorney General before he goes out to practice law"
-John F. Kennedy, January 21, 1961