South Park Mental House

The South Park Mental House is a mental hospital, located in South Park, where the boys commit Kyle in Mr. Hankey, the Christmas Poo, believing he is a clinically depressed fecophiliac, and/or insane, for his belief in Mr. Hankey.

Background
After several instances where Kyle tries to make people believe in Mr. Hankey, of whom are Stan, Kenny, Cartman, his mother, his father, Mr. Garrison, and Mr. Mackey, and after he is put on Prozac by Mr. Mackey, he is eventually committed by his friends at the request of Mr. Mackey, who had discovered Mr. Hankey (or to him, a regular piece of crap) in his coffee, and quickly blamed Kyle for it. However, after Mr. Hankey reveals himself to the townspeople at the Christmas play, they return in song and release Kyle.