Make a working model of an air conditioner.

a rock. No, something that's a laser.

@Petrol (View Post)
could you make a Graboid or shrieker? if you dont know what they are ill give you a picture

http://tremors.wikia.com/wiki/Graboid

look at the gallery and then search shrieker and ( yes it is called this) Ass Blaster

I've got an idea, make a heat source melting the ice in your brain.

A calculator

Artificial intelligence that you can talk to.

@InfernoIVIVIV (View Post)
TPT cam't take input from the microphone making that impractical.