This is an example from the book 'Influence' by Robert Cialdini.

A lady was having trouble selling a certain allotment of turquoise jewelry. It was tourist season, her store was full and she was asking a very reasonable price for the jewelry but she had no luck. She placed the jewelry in a more central area and asked her salesmen to push for it without any success. Tired of all this she wrote a note to her salesman "Everything in the display case, price*1/2". She found out after few days that all her jewelry was sold because the employee had read the '1/2' in her message as '2'. So the entire allotment had sold out at double the price.

The reason was that people applied 'expensive=good' principle since they could not estimate the intrinsic value of the jewelry.