Some idiotic kids thought it would be funny to body slam the hoods of cars. Several of the teens were arrested after police say they damaged at least three cars. To explain what they were doing, there is a growing trend on social media called "put em' in a coffin". The prank is pulled off by jumping back first onto something, in this case the hoods of cars.
You would think that kids would be smart enough to not film this kind of thing. But of course, if you're going to commit a felonious amount of vandalism, it's always good to have a friend document it for you so you can have a speedy trial.