Been cleaning up campsites and trails since age 5, it drove my Dad nuts.
He had a quirky sense of humor, what little humor he had. Camping 2 spots down from a bunch of drunken bottle smashers. He said no point in talking to the idiots and during the day we gathered up a bag of broken glass near the beach and around camp as normal
5:00 the next morning before fishing, without me knowing he quietly spread broken glass in front of all their tents and around their campsite. Wakes me up and into the boat we go, could not understand why we stayed fishing in the boat launch bay near the campsites. Around 9:00am we hear cursing and swearing, and he starts to laugh and laugh, telling me (age 12) about it as he motored out of the bay. I am sure they could hear him.
Funny seeing 6 teenagers pout and glare at everyone around during the afternoon guessing whodunit, one of the guys came out barefoot to take a leak..... That evening the bottle smashing and throwing was nonexistent.
One of my fondest memories of the old man and his frontier justice(big german farmer/butcher) his nickname was Tom the Terminator for multiple reasons at the plant.