A well-dressed man walks into a bar.
He takes a seat at the bar, and the bartender asks, "What'll you have?"
"I'd like a shot of 25-year-old scotch, neat."
The bartender was too lazy to go into the stockroom for 25-year-old scotch, and he figured the man wouldn't know the difference, so he poured a shot of 8-year-old scotch and set it before the man.
The man took one sip and said indignantly, "I did not ask for 8-year-old scotch, I asked for 25-year-old-scotch. Now please give me what I requested."
The bartender muttered to himself and still didn't want to fetch the older scotch, so he poured a shot of 15-year-old scotch and gave it to the man.
Again, the man took one sip and said, "I did not ask for 15-year-old scotch! Please give me 25-year-old scotch."
By now the bartender knew he couldn't fool the man, so he retrieved a bottle of 25-year-old scotch and poured the man a shot.
The man took a sip and said, "Now THAT is 25-year-old scotch."
By now everyone in the bar was watching the exchange, and they applauded the man for his discerning palate. Meanwhile, a drunk at the end of the bar peed into a shot glass, and handed it to the man, saying, "Here. Try this."
The man took a sip, spat it out and shouted, "My God! That's urine!"
The drunk said, "Good guess. Now tell me how old I am?"