The barkeep thinks about it and says "well I have seen a lot of stuff, if you can genuinely show me something I have not seen before, I will pick up your tab tonight".
So the man reaches into his pocket and pulls out a minature piano and sets it on the bar, then he reaches into his other pocket and pulls out a frog and sets the frog at the piano.
Low and behold the frog cracks his little fingers and starts to play!
The barkeep is just blown away by this and agrees that the man can drink for free for the rest of the night. Meanwhile there is a wealthy business man watching this unfold from a corner, so he gets up and approaches the man sensing a business opportunity. He says "Excuse me, but I saw your frog and I was wondering if he was for sale?"
The man replies "Sorry the frog is not for sale" and continues sipping his drink.
The businessman offers $10,000 for the frog, which the man again politely declines, followed by offers for $20,000 and $30,000. Until the business man finally gives up and goes back to his seat.
The man finishes his drink and asks the barkeep "Hey, if I can show you something else even more amazing, would you let me drink here for free any day?" The barkeep thinking he has seen everythig now readily agrees, what coul dbe more amazing than a playing frog?
Well the man reaches into another pocket and brings out a mouse and puts him on top of the piano. A few secons lader the mouse starts to sing along with the frog's playing! The barkeep is absolutely floored by this and again agrees to honour his deal.
The business man also sees this and again approaches the man, he offers $100,000 for the frog and the mouse, which the man again declines. The business man in a last ditch effort says "OK, what about $100,000 just for the mouse?"
The man takes a sip of his drink and says "Just for the mouse? Yeah OK" so the business man cuts him a check right there, and takes the mouse and leaves.
The barkeep says to the man "Are you crazy!?" A mouse like that has got to be worth 10x that much! What were you thinking?"
The man calmly sips his drink and replies with a wry smile "The jokes on him, the frog is a ventriloquist."