A tech company called, "CleanMyMac X" did a really good prank and it's also a great message, PICK UP TRASH! The prank features “Junkman”, a guy dressed up as a pile of trash who realistically crouches in different places around the city. Whenever passersby would discard their own refuse onto his unseen back, Junkman springs up and give chase. The idea is that this unexpected action will scare litterers enough to convince them to properly dispose of their refuse.