In a preview clip from the episode, the sisters lead Jenner out to the backyard, where a carnivalesque contraption awaits her.
Kourtney, 36, attempts to test out the water balloon component, but ends up soaking Jenner, 60, instead.
“Oh, my god, that is so f–king cold!” the momager squeals. “That is so mean. That was not very nice.”
Then the questioning begins.
“What is my due date?” a very pregnant Kim, 35, asks from afar.
“December the 24th,” Jenner says confidently, resulting in a water balloon dropping on her head after Kourtney hits a target with a green ball.
“Nope! Wrong-o,” Kourtney says.
The next question, about North West’s name, results in a pie being smashed into Jenner’s face.
“What is North’s middle name?” Jenner asks, after wrongly guessing it’s “South.”
“North doesn’t have a middle name!” Kim replies.
“That was so confusing,” Jenner complains.
Watch the Kardashian-Jenner women duke it out over trivia questions about their family, and tune into Keeping Up With the Kardashians on E! Sunday, January 24, at 9 p.m. EST.