Credit: Douglas Gorenstein/NBC

Jimmy Fallon has played just about every late-night talk show game imaginable with his guests — and even invented a few along the way — but not every one of them can be a hit, even with the guests

“Out of the 10,000 games they play on the show, I get a bomb,” Grandfathered‘s John Stamos joked after the first round of “Kid Dictionary.” During the game, he and Fallon had to guess what words kids were defining in videos submitted to The Tonight Show. But Fallon even acknowledges before the game begins that he forgot to clear the game with Stamos prior to the show’s taping, and so the Fuller House star ribbed Fallon about the game choice.

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“I’d have been happier playing ping pong,” says “Mr. Kid Dictionary himself,” as Fallon dubbed his guest. Check out the adorable, child-assisted chaos below.

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