Three Brothers

An Irish man walks into a pub. The bartender asks him, “what’ll you have?”
The man says, “Give me three pints of Guinness please.”
So the bartender brings him three pints and the man proceeds to alternately sip one, then the other, then the third until they’re gone. He then orders three more.
The bartender says, “Sir, I know you like them cold. You don’t have to order three at a time. I can keep an eye on it and when you get low I’ll bring you a fresh cold one.”