Pranksters attempted to deceive some of the larger brokerage offices on Wall Street. Several of the larger houses received telephone messages instructing them to sell large quantities of stock "at the market." Doing so could have caused a collapse in stock prices. However, the brokers, who were familiar with the actual voices of their customers, realized they were being deceived and did not carry out any of the sell orders. [The New York Times, Apr 2, 1925.]