i meant with a metal on screen keyboard that used spark to type words.

oh... i feel stupid. :(

Petrol:

My mind is frozen, what should I make now?

jalfor:

A calculator

@Petrol (View Post)
You might want to read this.

These are very good ideas. How about a bomb that really looks cool? I know people find that boring, but it's kind of fun to see the effects of neutrons or fireworks! ;)

Make a guitar (or any other instrument) for this.
https://powdertoy.co.uk/Discussions/Thread/View.html?Thread=8085