We wanted to make something cool with wearable sensors, but it turned out to be too difficult and then we decided to do this instead.
Everybody knows it's fun to use cardboard boxes to scare people.
You don't need a user interface when you have a talking Duke Nukem.
When someone comes too close (less than 1 meter (3 feet 3.37 inches)) Cardboard-Duke shouts randomly one of 11 shouts and his mouth moves while he talks. There is a delay of 8 seconds to prevent him from shouting all the time when someone is close.
We had issues with our first plan, Track Activities Pro 2000 because we couldn't get the needed pieces together.
Cardboard Duke was co-operative the whole time, no reported issues with it.