A guy walks into a bar and rudely demands a shot of 12-year old scotch. The bartender figures, "This guy doesn't know the difference." So, he pours a shot of 2-year old scotch.

The patron takes one sip and spits it out. He promptly hollers at the bartender, "I said 12-year old scotch, you bozo!"

Still unimpressed the bartender pours some 6-year old scotch. The patron takes a sip... same reaction.

But the bartender still doesn't believe the patron knows the difference. So he pours a shot of 10-year old scotch. Again, same reaction from the patron.

Finally, the bartender is convinced. He pours the patron a glass of 12-year-old scotch. The patron takes a sip and is most satisfied.

All the while this has been going on, a drunk at the end of the bar has been watching.

He slides a shot glass down the bar to the patron and drunkenly says: "Shay mishter, tashte this!"

The patron obliges... and he promptly spits it out. "That tastes like P*ss!" he yells back at the drunk.

The drunk replies: "It ish. Now, how old am I?"