For overactive kids.
Based on the technology behind MIT's new alarm clock that goes and hides each time you hit the snooze button so you have to get up and find it when it goes off again, this new doll would run randomly around the room saying things like 'nyah nyah nyah nyah, you can't catch me.' When it felt it's motion blocked when it was caught it would start frantically squirming around to free itself (the truly disturbed model would spit and kick at whoever was holding it. Of course, this one would have to be built out of highly durable material since its head would have to withstand a lot of bashing against things).
MIT's Alarm Clock