An old man walks into a bar and asks for a bottle of 40-year-old Scotch.

The bartender, not wanting to give up the good liquor, pours a shot of 10-year-old Scotch and figures that the man won’t be able to tell the difference.

The man downs the Scotch and says, “This Scotch is only 10 years old! I specifically asked for 40-year-old Scotch.”

Amazed, the bartender reaches into a locked cabinet underneath the bar, pulls out a bottle of 20-year-old Scotch, and pours the man a shot.

The man drinks it down and says, “That was 20- year-old Scotch. I asked for 40-year-old Scotch.”

So the bartender goes into the back room, brings out a bottle of 30-year-old Scotch, and pours the man a drink.

By now a small crowd has gathered around the man and is watching anxiously as he downs the latest drink.

Once again the man states the true age of the Scotch and repeats his original request for 40-year-old Scotch.

The bartender can hold off no longer and disappears into the cellar to get a bottle of prime 40-year-old Scotch.

Soon, the bartender returns with the bottle and pours a shot.

The man downs the Scotch and says, “Now this is 40-year-old Scotch!” The crowd applauds his discriminating palate.

An old drunk, who had been watching the proceedings with interest, raises a full shot glass of his own and says, “Here, take a swig of this.”

The man takes the glass and downs the drink in one swallow. Immediately, he chokes and spits out the liquid on the floor. “My God! That tastes like piss.” he yells.

“Great guess,” says the drunk. ‘Now, how old am I?’