It would be so cool to build a computer with a keyboard that types on its own and a mouse that moves and clicks on its own. It would be a great prop for a haunted house.

Yeah, we already have pianos, we could do that too

Pianos like that have been around for more than 100 years. They worked by using a rotating roll of paper with holes punched in it, and the holes would trigger mechanical mechanisms to play the keys.

The 1990 film "Ghost" has one scene where a computet keyboard is typing by itself. But seeing a real computer keyboard type itself in person would be amazing, especially if it was a really thin laptop keyboard.

If I had the money, I would buid a haunted house full of objects that appear to be manipulated by ghosts.

We could make one with simple pistons nowdays I bet