South Park (1997)

S5E10 How to Eat with Your Butt

Cartman crosses the line when a prank centered around Kenny's rear end leads to him experiencing a "funny fuse" explosion. When a picture of Kenny’s more flattering angle ends up on a milk carton, an unexpected couple shows up in South Park, intent on reclaiming their lost child. This leads to a series of comedic and absurd interactions.