At last weekend's taping for the TV Land Icon Awards, airing this Sunday, Stamos explained that famed director and producer Garry Marshall, whom he's previously called his "showbiz godfather," was the person who prompted him to come up with the now-famous line, which became Uncle Jesse's signature line on the hit '90s sitcom as .
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And coin a catchphrase he did – along with the rest of his costars, who got laughs by saying, "How rude!" "Cut! It! Out!" and "You got it, dude," to name a few.
As for Marshall, 81, who presented Stamos with his Icon Award, he gave some background on the history behind repeating phrases to create catchphrases on television.
" 'Sit on it' we had to put on Happy Days for 10 weeks," said Marshall, who created and executive-produced Happy Days.
He also explained that it takes time for audiences to pick up on the recurrence.
"The cast kept saying, 'Nobody laughs,' " Marshall said of "sit on it."
"It takes a minute," Marshall said, before praising Stamos. "[John] was brave enough to do it."
The TV Land Icon Awards air Sunday at 9 p.m. ET on TV Land.