The Kardashian-Jenners November Cosmopolitan cover stars revealed their most embarrassing moments in video aptly called "Kosmo Konfessions."
Kylie hesitated to share hers at first—"I know they're going to use it and I'm just too embarrassed," she said—but Kendall nudged a little, Kylie went for it ("When I was 5..."), and Kendall started cracking up. Kylie confessed: When she was 5, she pooped her pants and left a trail of poo throughout the house.
Watch the entire video above to hear the full konfession, and also hear about the time Kris joined the mile-high club.
This article originally appeared on Cosmopolitan.com. Minor edits have been made by the Cosmo.ph editors.