Drugs and Milk

It isn't?

Well apperently its not, not atleast what the thing says about the butt. Maybe your thinking of the gallon smash

People do it with alcohol, so I'm not sure if this is a joke.

A dick "Prank", you get a gallon of liquid at the store, in a jug. Smash it in the eiles when one is looking, film it. Reaction joke.

Yeah, I was a courtesy clerk when someone did this right at closing time.