Shop staff were left bemused after a woman bought 10,656 Mars bars.
The woman bought 200 boxes of the chocolate
She made the huge purchase in Woolworths on Edgware Road, central London, last Tuesday.
The woman asked for all the Mars bars they had - including ones in the stock room and paid the £2,131 with new £50 notes.
A spokesman for Woolworths said: "We have no idea what she wanted that many Mars bars for but it raises all sorts of questions."
She then left it to a chauffeur she had with her to load the 200 boxes of chocolate into the back of a waiting car.
Daniel Himsworth, a spokesman for Woolworths, said: "The manager of the store said she looked Lebanese. She was smartly turned out in traditional black robe and a head- dress.
"I can certainly say we have never had that many Mars bars bought at the same time in the same store before."