Upgrade a simple, off-the-shelf Ouija board prop into a wirelessly-controlled spirit board including custom audio clips and RGB NeoPixel lighting.
Using CircuitPython, a Feather nRF52840, and a Motor FeatherWing, plus the Bluefruit app, you can take control of the seance, haunt, or theatrical effects of your choosing!
Haunted Ouija Board
You can find these (and similar props) at big box stores and Halloween stores, or search for them online. Here's one example.
The specific one used in this guide is Item #45079 by Sunstar Industries and can be found in this SKS Novelties catalog.