Yeah, a friend pointed out that a 555 timer could be used to generate a 16khz signal. I'm intrigued by Calvin's nasty surprise, too. Maybe a big spike that shoots up through the seat!

With a heads up display in the car, it would be cool to take a picture of the thief and display it for him while the car calls the police.

How about using the cell phone mute signal to make the Empeg go into security mode requiring a password to start up again. The Empeg could display "self distructing".

-Hoagy.