The scene: high-pitched squealing, flailing limbs at floor level, the occasionally toy tossed in the air. Our heroine, innocently carrying laundry, crosses the path of destruction…
"YEE-OOWCH!! All right, that’s IT, you two! Break it up…
…and no more biting Mommy’s butt!!"
Keen: "Sorry."
Zero tolerance for butt biting.
That’s a very funny mental image.