"Sit on it!" Do you know what television show that line is from?

[MikeRJ]

And have you ever heard anyone say it outside of television?

[FunkyMonkee]

Happy Days, unless it was on the very first episode on, "Love, American Style"
Another version we used to use was, "Sit on it and spin!".

[MikeRJ]

But sit on what? And do/did people actually say it in real life?

[FunkyMonkee]

I can't say that people actually said it in real life, at least back in the `50's. But, terms of lingo change depending on where you're from. I never heard anyone say it `til the `70's.
As for sitting on what, probably your middle finger. "See this? Sit on it and spin!!"

[Joshydavid25]

I think it's from a sitcom maybe.. And yeah I've heard it said outside of T. V before... Probably not in the same way..

[jazzy34]

Happy Days.