Joe walks into a bar and orders a 21-year-old whiskey.
He takes a sip and then spits it out.
"I asked for a 21-year-old, this is 18 years! I'm not paying! Give me a 12-year-old cognac."
Mark, the bartender, serves him, and Joe spits it out again.
"This is only 10 years! I'm not paying!"
Mark starts getting frustrated.
After more and more drinks with the same reaction, he serves another one and says:
"This one's on the house."
Joe takes a sip and immediately spits it out.
"This tastes like piss!"
Mark smiles and says, "Now tell me, how old am I?"
