(the whole thing tells a story: Truck backs up to dead car. Flat
  plate slides back and back end touches ground to form a ramp.
  The car is gonna go up that ramp, but how? Chain is hooked under
  car somehow. Other side of chain is hooked into rotating thing.
  Motor turns and makes appropriate groaning noises. car moves
  closer and closer as chain gets wrapped around spool thing. Car
  goes up ramp and gets closer and closer - will it hit the spool
  thing? Motor shuts down with apropriate noises. *whew*. Truck is
  safe. Car is safe. "