Arduija - Arduino + Ouija
Arduino-controlled Ouija Board that spells out spooky messages on its own.
Ouija Boards have always fascinated me, but I'm not convinced there are any actual spirits spelling out messages from beyond. The following videos show a couple attempts at creating robotic Ouija Boards to create a literal ghost in the machine.
The first attempt was very scrappy, but it worked well enough to prove my proof of concept.
The second attempt was much better. The Actobotics parts used were much better for the job.