Amazon is looking out for you, but it might hurt a bit. The company is now selling a bracelet that will give you 350-volt electric shock every time you partake in a bad habit. The idea is each time the wearer misbehaves, you give yourself a shock with the bracelet in an effort to break your bad habit. The device can also be used with an app that appoints your friends as digital guardians, able to shock you if you break the rules. Its inventor says the shock feels like if you were to touch a doorknob after rubbing your socks on the carpet.