A young couple hit the absolute jackpot when they were accidentally given a bottle of what they thought was house wine, which actually turned out to be worth $2000 (£1500).
New York restaurant owner, London born Keith McNally, revealed that a manager at his Manhattan brasserie Balthazar made the costly mix up by accident.
They gave the expensive bottle of wine to a young couple, who had ordered a bottle of £13 Pinot Noir.
Meanwhile a group of Wall Street businessmen thought they were drinking Chateau Mouton Rothschild and were none the wiser.
Posting on Instagram, he explained: "One night at Balthazar four Wall Street businessmen ordered the restaurant's most expensive red wine: a $2000 bottle of Chateau Mouton Rothschild.
"One of the two managers transferred the Bordeaux into a decanter at a waiter's station.
"Simultaneously, a young couple ordered the restaurant's cheapest red wine, a $18 Pinot Noir, which they wanted pouring into a decanter.
"These two very different wines were now in identical decanters."
Keith continued: "Mistaking the $18 decanted wine for the $2000 Rothschild, the first manager formally poured the cheap wine to the businessmen.
"According to the manager, the host considered himself a wine connoisseur, and showing off to his guests, tasted the cheap wine before bursting into raptures about its 'purity'.
"The young couple who ordered the $18 Pinot Noir were inadvertently served the $2000 Chateau Mouton Rothschild.
"On taking their first sips of what they believed was cheap wine, they jokingly pretended to be drinking an expensive wine and parodied all the mannerisms of a wine snob."
He explained: "Taking the latter route would certainly be the easiest.
"Also the cheapest. It was unthinkable at this point to pull the real Bordeaux from the young couple's table.
"Besides, they were having too much fun acting out drinking a $2000 bottle of wine. I decided to veer from my normal behaviour, and tell both parties the truth."
It all turned out to be fine though, with Keith adding: "The Wall St. businessman responded by saying, 'I THOUGHT that wasn't a Mouton Rothschild!'
"The others at the table nodded their heads in servile agreement.
"The young couple were ecstatic by the restaurant's mistake, and told me it was like the bank making an error in their favour. The trouble was, it was me who was down $2000, not the bank."
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