Be warned as Cartman, from South Park, recites a version of the filthiest, most offensive jokes of all time.
"The Aristocrats" is a joke format that has circulated among comics since at least the days of vaudeville.
You start by describing a family in a meeting with a showbiz agent, asking if they can perform their act.
You then describe whatever mixture of incest, analingus, facials, muscular tubes and the family dog as enters the bad parts of your head.
Once you've surprised yourself with some of the images you have the family tell the impresario that their act is called "The Aristocrats" -- and you're home.