Quote from Dick in Proud Dick
Dick: Welcome to Rusty's. How may I serve you?
Man: How do you make your burgers?
Dick: Excellent question. First a clamp comes down onto the cow's head, forcing it onto a conveyor belt, where a prod is inserted into the cow's rectum, electrocuting it.
Man: Give me two.
Dick: Thank you. And remember, at Rusty's, E. coli is not on the menu.