These plants are along the roadside, along the way home. The game is to drive along close enough to wack them, especially when the passenger is caught in blissful unawareness.
This game only lasts for a brief time. Only from the time the plants grow to the needed length and breadth. Eventually, they will encroach to far into the roadway. Then, someone cuts them down.Until then, game on.
From The House At The Edge Of The Forest.