It's painfully easy to waste time online, such as by playing video games or reading Neatorama's competitors. MIT graduate students Robert R. Morris and Dan McDuff had that problem, which is why they built the Pavlov Poke.
After spending too much time on Facebook, a keyboard-mounted device delivers a mild electrical shock to the computer user. Alternately, a program has a stranger call you on the phone to scream at you that you're wasting time.
Link -via Dave Barry