...and says to the bartender, "Give me three pints of Guinness, lad". The bartender obliges, and the Irishman lifts two of the three glasses to the air, as if toasting some invisible person. He then set them down, and finished all three glasses by sipping from one, then the next, and the next until it was empty. Bartender, naturally curious, asks what's up.
"Oh, me two brothers all live about. Since we can't meet and have a pint together, we do it from afar like this."
This continues for a few more months, until finally, one day, the Irishman only orders two pints of Guinness. Bartender notices this and says solemnly, "Only two today? I'm sorry. Did one of your brothers pass away?"
"No, no, nothing of the sort. I've quit drinking!"