ATM PIN NUMBER REVERSAL (GOOD TO KNOW)

A forward from one of my friend, but never tried out practically..... Please let me know if it reaally work.........................
"If you should ever be forced by a robber to withdraw money from an ATMmachine, you can notify the police by entering your Pin # in reverse.For example if your pin number is 1234 then you would put in 4321. TheATM recognizes that your pin number is backwards from the ATM card you placed in themachine.The machine will still give you the money you requested, but unknown toThe robber, the police will be immediately dispatched to help you.This information was recently broadcasted on TV and it states that it isseldom used because people don't know it exists.Please pass this along to everyone possible"