An electronic circuit controls the remote on a remote-controlled car.  A person’s initials are spelled out as the car drives around the “track”.

I hacked the remote adding a connector for a circuit that automates the joysticks.  It worked ok but required a lot of intervention.  Without feedback on actual position of the car, it would draw a slightly different pattern each time as the batteries ran down thus slowing the car’s speed of travel.  Great fun! (Despite the constant tinkering on Christmas morning.)