Your money: Maybe not as safe as you think. Security expert Barnaby Jack showed off three different ways to hack an ATM last week, including one particularly flashy method that left the machine playing music and spitting out twenties.

Jack, speaking at the Black Hat Security Conference in Las Vegas, was able to hack ATMs he had brought on stage both physically—using a $10 master key available online—and remotely, so long as he knew the machine's phone number or IP address. (The second method allowed him to gain access to previous users' stored PINs. Go ahead, check your balance online. I'll wait.)

The most fun thing, though, was making the machine play a jaunty little tune as it spit out hundreds of dollars:

[Surge Desk; Tech Review via Discover]