Back before the Interstates, when US hwy 1 was a major North-South route, kids in the country used to get an old suitcase and stuff whatever live critter they could find in it. Racoon, possum, bobcat, snake.
Then set it on the side of the road like it had fallen out of a car. Wait for someone to stop and pick it up, then follow them to see how quick the car stopped, doors flew open and passengers bailed when they opened it.
Or, set up just over the crest of a hill, stake out two black phone wires across he road a couple of feet apart, watch folks lock up their brakes thinking they were about to hit a speed trap.
Then set it on the side of the road like it had fallen out of a car. Wait for someone to stop and pick it up, then follow them to see how quick the car stopped, doors flew open and passengers bailed when they opened it.
Or, set up just over the crest of a hill, stake out two black phone wires across he road a couple of feet apart, watch folks lock up their brakes thinking they were about to hit a speed trap.