Some of it seemed staged. Either way I don't think it's anything worse than any other Halloween prank. He didn't actually get into anyone's space. He is actually damn lucky I wasn't driving that car at the end because I may have just run him over. Easy way to stop the JV wannabe.
As far as halloween pranks go that was pretty tame.
Other than the part at 2:29ish where he is pretty close standing over the dude on the ground and waving the chainsaw around. If not staged, I would consider that invading my space, and threatening me with a deadly weapon.