So what's the new planking, owling, horsemanning and Batmanning? Supermanning. The act of sitting out the back window of a car and appearing to fly by the driver as if you are the popular cape-rocking superhero. The various Supermans in this video can be seen asking for directions, bumming cigarettes, and generally shocking the pee out of drivers.
I predict this trend will last all of two weeks. Because once the number of car accidents skyrocket and backseat riders start falling out of fast-moving vehicles, people will (hopefully) recognize this meme's extreme stupidity.