The Kardashian Family: Then & Now

"Does anyone have any good prank ideas to do to a sleeping person? Me and @khloekardashian need help," Kourtney asks her followers.

Note to self: Never fall asleep first when Kourtney and Khloe Kardashian are around.

In a sneak peek clip from Sunday's episode of "Keeping Up with the Kardashians," the two Kardashian sisters decide to pull a prank on Kendall Jenner after she goes to bed early.

Though Kourt wants to "put a blueberry up her ass," the tricksy twosome instead turn to Twitter for some suggestions. "Does anyone have any good prank ideas to do to a sleeping person? Me and @khloekardashian need help," asks the elder of the two.

The winning response: "Put a few squares of chocolate in their bum crack so it melts, and when they wake up they think they pooped themselves!"

Sadly, it doesn't go as planned -- see Kendall's reaction below.

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