A man walks in a bar and the bartender asks, "What'll you have?"

The man answers, "A scotch on the rocks, please."

The bartender hands him the drink, and says, "That'll be five dollars."

"What are you talking about? I don't owe you anything for this," the man replies.

A lawyer, sitting nearby and overhearing the conversation, then says to the bartender, "You know, he has a point there. In the original offer, which constitutes a binding contract upon acceptance, there was no stipulation of remuneration."

The bartender, now pissed off, says to the guy, "Okay, you beat me for this one. But don't ever come back here again!"

A few days later, the same man walks into the bar.

The bartender says, "What do you think you're doing in here? I can't believe you've got the audacity to come back!"

The man says, "What are you talking about? I've never been in this place in my life!"

The bartender replies, "I'm very sorry, but this is uncanny. I feel like you were here a few days ago. You must have a double."

To which the man replies, "Thank you. Make it a scotch."