Headless horseman

An alcoholic mixed drink invented in San Francisco which combines one part straight Jameson and one part straight Jack Daniels. "Headless" because you have to be stupid to order it and "horseman" because you need to be able to have the tolerance of a horse to drink it.

"Bartender, I'd like one headless horseman please"
"You seriously want me to mix jack Daniels and Jameson?"