Actually, I've been working on a way to break into a person's call and blast an audible warning at them. At the same decibel level as a live "Who" concert. If you were sandwiched between two stadium speakers. Instant brain soup.
I'ed settle for an app that kills the car's ignition system if the driver activates the phone without a headset.
I live in the right now, Kindlekitten.
And right now, I think cell phones have turned people into self absorbed idiots who think their now is more important than my now. Until I activate their cell phone's colonoscopy app.