ATM Emergency Sequence

[Shifu]

Snopes is always your friend on these things.

However, according to Wiki, it COULD be done but isn't:

"ATM SafetyPIN software is a software application that would allow users of automated teller machines (ATMs) to alert the police of a forced cash withdrawal by entering their personal identification number (PIN) in reverse order.[1] The system was invented and patented by Illinois lawyer Joseph Zingher (U.S. Patent 5,731,575). Contrary to a widely circulated hoax (see below), the system is not implemented in ATMs presently."

And the reason for it it is:
1. Not enough police resourcers as they are stretched to the limits chasing pensioners for illegal parking and doing 5 km/h over limit
2. They can not fine you for it so it does not generate any revenue for the government
3. People with a palindrome PIN's would be arrested for stealing their own money