An Irishman walks into a bar in Dublin, orders three pints of
Guinness and sits in the back of the room, drinking a sip out of
each one in turn. When he finished all three, he comes back to the
bar and orders three more.
The bartender says to him, "You know, a pint goes flat after I draw
it; it would taste better if you bought one at a time." The
Irishman replies, "Well, you see, I have two brothers. One is in
America, the other in Australia, and I'm here in Dublin. When we
all left home, we promised that we'd drink this way to remember the
days we all drank together."
The bartender admits that this is a nice custom, and leaves it
there. The Irishman becomes a regular in the bar and always drinks
the same way: he orders three pints and drinks the three pints by
taking drinks from each of them in turn.
One day, he comes in and orders two pints. All the other regulars
in the bar notice and fall silent. When he comes back to the bar
for the second round, the bartender says, "I don't want to intrude
on your grief, but I wanted to offer my condolences on your great
loss."
The Irishman looks confused for a moment, then a lights dawns in
his eye and he laughs. "Oh, no," he says, "Everyone is fine. I've
just quit drinking!"