I read this earlier, and I was immediately transported back to my childhood, when a neighbor strung barbed wire across our bike path.
I've been riding for years and your story reminds me of a punk-ass neighbor of mine putting branches across a dirt track that I built in the woods beside my house once. I was riding an XR350R at the time (hardly a loud bike) and came around a turn to the barrier. I stopped in time. I knew that the punk was in his backyard on top of the hill above me and I yelled at the top of my voice for him to "come down here and get some you ()@&%#". Never had a problem again.
My town had kids riding motorcycles through back yards during one summer. Then one hit a wire used for hanging clothes and was decapitated. That stopped them pretty quickly.
This isn't even funny. One of my dad's friends was decapitated when riding a snow mobile in a similar situation.
"...I was immediately transported back to my childhood, when a neighbor strung barbed wire across our bike path."
My older brother tells the story of him and his friends rigging up a device to get a car that was crossing a friend's yard (corner lot). They filled two cans with cement with a wire between them. Propped them up on sticks at door height where the guy would drive. The car would snag the wire and the cans would come flying into the door panels.
Not sure if it actually worked. And it sounds like a good idea - until a motorcycle or sports car comes through and you hit the people in the head with the cans. Or - the guy with the dinged door panels stops and throws rocks through all of your windows.
Kids will be kids. (Stupid and hopefully VERY lucky.) I wonder if this plastic wasn't put up to catch a car (more likely that a car would be on the road). The kids are back in the woods to laugh at the driver's shock and then his efforts to get the wrap off his car. Not thinking about a motorcycle - or a paniced driver careening off the road.
And yes - even though "kids will be kids" (not thinking is the key phrase) they should get punished severely.
We used to put a scarecrow sitting in a chair at the top of a hill... oh the memories..