Submitted by Rimma 994 days ago Categories: robber ATM machine

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If you should ever be forced by a robber to withdraw money from ATM machine, 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. The ATM recognizes that your pin number is backwards from the ATM card you placed in the machine. The machine will still give you the money you requested, but unknown to the robber, the police will be immediately dispatched to help you.

http://urbanlegends.about.com/library/bl_reverse_pin.htm