After freshman year of college, I finally fulfilled a childhood dream of acquiring an RC car. I gutted it and rewired it to use hobby servos controlled by my computer via a bluetooth serial adapter. I didn't want to spend money on PWM motor driver, so I used one servo with a big rheostat for speed control, and a second for a horrifically janky motor direction control. As is traditional in true hacks, I of course had a VB GUI for controlling it. And it worked great!
NIKKO Alienator RC Car
Seems to be from the 80s, so it's as old as me?!?