The Judas Cradle
Closely related to impalement, this gruesome punishment entailed having the victim sit on the pyramid-shaped cradle, after which they would be forced down on it by ropes with the intent of stretching the victim's orifice over a long period of time, slowly impaling them. To add to the overall humiliation, the victim was usually naked and the device was rarely washed. So if the torture did not kill you, the infection contracted from it would.
