An Irishman walks into a bar and orders three beers. He takes his beers to a table, and takes a sip from each mug in turn, until all three are empty. Then he proceeds to the bar and orders three more beers. The bartender looks irritated and explains that if he orders one beer at a time, they'll be fresher and more enjoyable. Well, says the Irishman, I just moved here from Ireland, and left my two dear brothers at home. We made a promise to each other that whenever we drink, we'll pour a pint for whichever brother isn't there. The bartender thinks about it, says Fair enough, and pours another three beers.

Over time, the Irishman becomes a regular, and the bartender knows to pour three beers for him. One day, the Irishman comes in and orders two beers and then sits down at the table. The bartender brings him the two beers, and offers his condolences for the loss of his brother. The Irishman looks at him strangely, then smiles and says Oh no, both my brothers are fine! I just quit drinking!