A man walks into a bar and orders a 12-year-old scotch.
The bartender, believing that the customer will not be able to tell the difference, pours him a shot of the cheap 3-year-old house scotch that has been poured into an empty bottle of the good stuff.
The man takes a sip and spits the scotch out on the bar and reams the bartender. "This is the cheapest 3-year-old scotch you can buy. I'm not paying for it. Now, give me a good 12-year-old scotch."
The bartender, now feeling a bit of a challenge, pours him a scotch of much better quality, 6-year-old scotch. The man takes a sip and spits it out on the bar. "This is only 6-year-old scotch. I won't pay for this, and I insist on a good, 12-year-old scotch. The bartender finally relents and serves the man his best quality, 12-year-old scotch. The man sips the drink and says, "Now that's more like it."
An old drunk from the end of the bar, who has witnessed the entire episode, walks down to the finicky scotch drinker and sets a glass down in front of him and asks, "What do you think of this?" The scotch expert takes a sip, and in disgust, violently spits out the liquid yelling "THIS TASTES LIKE PISS."
To which the old drunk replies, "That's right, now guess how old I am."