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Watch: Kim Kardashian And Kylie Jenner Frame Kourtney For Poisoning Kris!

The 'KUWTK' hijinks get out of control.

On the upcoming episode of Keeping Up With The KardashiansKris Jenner isn’t feeling well, and it’s making her more than a little bit paranoid. The momager is convinced someone is poisoning her! She even tests her tap water against Kourtney Kardashian‘s to make sure there’s nothing wrong with it, as her daughters make fun of her. “Well, if somebody’s poisoning me, I’m gonna get to the bottom of it,” she decides.

Naturally, Kylie Jenner and Kim Kardashian see an opening. Watch the clip above to see their hijinks in action.

“Oh my God, we have to f— with mom,” the 37-year-old and 21-year-old sisters decide.

They give Kris a ring. Once the matriarch answers her phone, they plant the seeds of doubt. “It’s me and Kylie. We figured the whole thing out,” the youngest says.

Kim drops the fake bomb, “Kourtney has been poisoning you this whole time!”

Kris is, obviously, taken aback. “Stop. No way! I just was with her. Why would she do that?” Thankfully, the sisters don’t give her completely malicious intent.

“Just because she’s, you know, has been trying these new all gluten-free organic drops and we think that she’s been adding these things to our food,” Kim continues. Sure, blame it on gluten-free things, Kim.

This little prank is pretty risky given that Kim and Kourtney have been at each other’s throats all season. When Kim called Kourt the “least exciting to look at,” the elder sister broke down in tears. Then, when the KKW Beauty mogul found out Kourtney isn’t planning on joining the family for Christmas, she called her “the new Rob.” Fans will have to wait and see if Kourtney takes kindly to this poisoning lie.

The new episode of Keeping Up With The Kardashians airs this Sunday at 8 p.m. on E!

Are you on Team Kourtney or Team Kim? Let us know in the comments!