(This one is definitely older than I am)
A man stumbles up to the only other patron in a bar and asks if he could buy him a drink.
"Thanks", comes the reply.
The first man then asks: "Where are you from?"
"I'm from Scotland", replies the second man.
The first man responds: "You don't say, I'm from Scotland too! Let's have another round to Scotland."
"Of Course", replies the second man.
Curious, the first man then asks: "Where in Scotland are you from?"
"Aberdeen", comes the reply.
"I can't believe it", says the first man. "I'm from Aberdeen too! Let's have another drink to Aberdeen."
"Of course", replies the second man.
Curiosity again strikes and the first man asks: "What school did you go to?"
"Saint Andrews", replies the second man. "I left in '62."
"This is unbelievable!", the first man says. "I went to Saint Andrews and left in '62, too!"
About that time in comes one of the regulars and sits down at the bar. "What's been going on?", he asks the barman.
"Nothing much," replies the barmen. "Just the MacGregor twins pissed drunk again."