South Park S05 E10 How to Eat with Your Butt

"Four boys. One f**ked-up town."

Cartman has finally gone too far when a prank involving Kenny's sweet cheeks results in him blowing a "funny fuse." After a photo of Kenny's better side finds it's way onto the side of a milk carton, an unusual couple arrives in South Park to claim their missing child. Much ass kissing ensues.