Have mercy, John Stamos has revealed the inspiration behind hisFull Housecatchphrase.

He always said, Get a catchphrase, you need a catchphrase.

Im not kidding you.

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Credit: EW

Sit on it we had to put onHappy Daysfor 10 weeks.

The cast kept saying nobody laughs, Marshall, who executive producedHappy Days, said of the famous saying.

He added that audiences need more time to pick up on the recurrence.

It takes a minute, Marshall said, before praising Stamos.

[John] was brave enough to do it.

Marshall isnt wrong: StamosGrandfatheredcostar Paget Brewster said her recollection of have mercy was admittedly cloudy.

Brewster then referenced a third&Full Houseslogan: Cut it out.

I only didnt see Johns.

What a lousy costar I am, she joked.

All right, Ill watchFull House…

I havent seenFull House.

Im a bad friend.

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The TV Land Icon Awards air Sunday on TV Land.

For more information on the show,head to the TV Land website.

Check out Stamos and Marshall discussing the meaning of the awards above, and Brewsters feelings on Stamos below