If you want to mess with Kendall Jenner, then be prepared to answer to her big bro Brody.
In a clip released from the upcoming episode of "Keeping Up With The Kardashians," the two are in Thailand on their annual family vacation, where things took a brief turn for the worse.
As Brody orders a round of drinks at a bar, Kendall is standing close by, as a man sitting next to her, whose face is blurred out, grabs her butt as Kendall blurts out, "Excuse me!" and quickly moves away.
Kendall then filled Brody in on the mystery man's disgusting gesture, saying, "Brody, that guy just touched my ass. That guy just grabbed my ass."
Brody wasted no time in confronting the groper saying, "Did you just f--king touch my sister?" The man confusingly looks around and flat out denies that he did (even though cameras clearly caught him).
Brody, having none of it, asks, "Are you f--king kidding me, bro?" before hitting the man's sunglasses off his head.
We will get to see how this all plays out when "KUWTK" airs this Sunday on E!