By Teresa Jue
Updated November 18, 2014 at 03:18 PM EST
Credit: Douglas Gorenstein/NBC

Benedict Cumberbatch had a case of the giggles Monday night on The Tonight Show Starring Jimmy Fallon while playing the show’s new game, Three-Word Stories.

The premise is pretty simple: Each person takes turns telling stories that can be summed up with three words in order to guess one keyword. The game went swimmingly until things took a turn for the Kardashian as Cumberbatch tried to get Fallon to say “booty.” Watch the video to see Cumberbatch giggling and giggling as he tries to think of more euphemistic ways to get Fallon to say the word.

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