Does this really work? (cash machine pin code)

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does anyone know if this is true? I think i recieved an email telling me this. Apparantly if you put your pin code in to a cash machine in reverse order it will somehow connect to the police and theyl know which cash machine your at come out straight away. Say if someone heldyou at knife point ant told you withdraw all your money. You put your pin in backwards and it will still give you the money but the police will be sent immediatly! This is a good idea if its true but not many people know about it!