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On Sunday's most recent episode of Keeping Up With the Kardashians, Rob Kardashian went MIA after ditching the family's group trip to Thailand—and no one knows where he went!

But what viewers didn't see prior to the trip is this bonus scene, where Khloe Kardashian tries to get her younger brother to join her and BFF Malika for lunch. But things don't quite go as planned when Rob declines Khloé's invitation and the two get into an argument that quickly turns physical!

"What the f--k are you doing?" Rob exclaims as Khloé grabs him by the arms. "Get away from me!"

KUWTK Clip, Fight

After enduring several slaps to the face, Rob angrily examines the damage to his arms.

"Those are some serious bite marks," he points out. "Nail, nail, nail!"

Watch the above clip to see the full-on fight between the two siblings!

Tune-in to a brand new Keeping Up With the Kardashians this Sunday at 9/8c on E!