I got bored of tidying my tools so I made this. It’s based on AndyGadget’s Piecax the Poltergeist. A Troublesome Spirit in a Box. I’ve been meaning to make it for a while because it’s a simple build which brings a smile to people’s faces. I’m a fan of the stuff Andy makes; novel ideas, clear instructions and the code is already written and squeezes as many functions as possible into the space available.

Basically, what you tap on the side is drummed back to you. The case is a salmon tin and the balloon is one I had lying around. The video will make everything clear.