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"How to Eat with Your Butt" is episode 510 of the Comedy Central series South Park. It originally aired on November 14, 2001. This episode is not to be confused with the Season 6 episode "Red Hot Catholic Love", in which people literally begin eating with their butts.

The episode begins with the South Park children having their class pictures taken; it is here that the viewers see Stan and Kyle's hair for the first time (and with a full head of hair, rather than shaved, as in "Super Best Friends"). It is seen that Kyle has an auburn "Jew-fro" and Stan has a plain mop of black hair, like his dad. During the course of this, Kenny wears his parka upside down and stands on his head with his feet through the sleeves so that his "ass shows through his hood."

Ms. Choksondik says that one boy spoiled his photo and will not get it back. It turns out that she is referring to Butters, rather than Kenny. The adults are irrationally convinced that Butters' normal face is some sort of silly face. Butters becomes a self-hating recluse.

To compound this trick, Cartman then turns in Kenny's photo to a milk company, which places Kenny's photo on a milk carton. Cartman's description of him includes that he has a "winking brown eye", "blonde hair", and "rosy cheeks".

The photo draws a response from a couple, Martha and Stephen Thompson, who lost their son some years earlier. They suffer from a fictitious congenital condition known as "torsonic polarity syndrome" or "TPS" which has them born with their faces replaced with human buttocks. With the syndrome, however, they still retain all normal functionality of their faces (including noses, eyes, etc.).

When the Thompsons appear looking at Cartman's house for Kenny, he is stunned and can no longer laugh, believing he has seen something so incredibly funny, that nothing else will ever be able to make him laugh again. Nevertheless, Stan and Kyle maintain that Cartman is experiencing a feeling of pity, perhaps for the first time, for the Thompsons and their predicament, and it is this which prevents him from laughing.

At the end of the episode, the South Park milk company officially announces that Ben Affleck was the missing son of the Thompsons. When Cartman finds out, he starts to laugh again. Stan and Kyle decide that he couldn't laugh before because he actually felt guilty for making the Thompsons believe their son had been found – which Cartman vehemently denies, of course.

Kenny is run over by a murderous motorcycle driver; this had been foreshadowed via news reports earlier in the episode.