when I was around 14, my friends and I were walking around in the deep wooded country in Mississippi and had the idea to tie a really thick horsehair rope across a road, tying it to a tree on each side. We put it right on the other side of a curve so the car wouldn't have time to avoid hitting it.
Then we hid in the woods and waited for a car to come by. This car hit the rope and it caused some serious damage to the front end and bumper.
I remember the guy getting out of his car and running into the woods screaming at us and saying he knew we were there. We just hid until he went away.
I still feel bad about that