South Park: 10 Most Disturbing Episodes

10. Proper Condom Use - Season 5, Episode 7

Perhaps the most outright disgusting episode on this list, Proper Condom Use is chock-full of nauseating moments that will permanently scar you.

When Cartman is taught how to 'milk a dog' he enthusiastically tells all of his friends, which leads to Stan masturbating the family dog in front of his parents' book club. The outraged townsfolk then decide to lower the age in which sex education is taught in school, and as a result, the highly deranged sexual dysfunctions of both Mr Mackey and Miss Choksondik are shown to us in the most graphic manner possible.

And trust us when we say it's not pretty.

That rather gruesome sex scene aside, we're also treated to Mr Garrison's unconventional way of putting on a condom, numerous up-close photographs of real sexually transmitted diseases, and Cartman discovering that you don't need to go to the bathroom when you're wearing a condom all day.

The episode does wind its neck in a little towards the end when it settles into becoming a Mad Max parody, but the creators just couldn't help themselves and it ends on the townsfolk gleefully watching as Stan once again w*nks off his dog Sparky.