Poena cullei
Poena cullei, or the penalty of the sack was an ancient Roman form of execution imposed on people convicted of patricide, or the murder of one's parents. It involved being sewn into a sack with vicious animals, most commonly a monkey, snake, and chicken, but others were sometimes used as well. The sack was then thrown into a body of water to sink. In the course of drowning, the animals would attack one another and the human in the bag.