A few years back, there were some stories
about how some scammers had found online manuals for popular ATMs, which included a default password, which was rarely changed (yes, that's an amazingly stupid design). This meant that it was fairly easy to program the ATM to believe that it held different denomination bills. For example, you could program it to think that it held $5 bills when it actually held $20s -- and then if you took out "$40" you would be given 8 bills -- or $160. Not surprisingly, other hackers have replicated this scam a bunch of times -- aided in large part by ATM owners who still haven't changed the default password
Still, if you were a scammer pulling such a scam, you might think that it would make sense not
to pull it at the same store multiple times. But, that's exactly what two guys did last year, where they tried to hit a local restaurant's ATM for the fourth time
. By that point, the manager had been alerted to look out for them, and called the police on them
when they came in again. There was a bit of a mess after that, as the manager tried to pull a gun on the scammers, and there was some sort of scuffle, a gunshot, and then a car chase... but eventually the guys were arrested. So, once again: ATM makers: stop offering machines with default passwords. ATM owners: change the default password on your machines. Scammers: don't be so dumb as to try to rip off the same place multiple times (or, maybe that's what we want, since it makes them easier to catch... but it's still dumb).