The way spidile is played is; while in the car, you keep on the look out for other cars that have one (1) headlight out(there are a couple of different versions of the game. The way I play is if one is out or obviously dimmer then the other. My friends play where the headlight can ONLY be out. It depends on who you're with) When you see a car(s) thats headlight is out, you hit the ceiling of the car with your fist and yell "SPIDIDLE!" This counts as one (1) point. When, and if, you see a car in a rearview mirror, you must hit the ceiling of the car with your fist and yell spididle backwards (eldidips) This counts as two points.
Note: You can ONLY play with headlights.