My niece graduated from 8th grade last week. The ceremony was held in the gym, not outdoors. There was one family that screamed and yelled throughout the entire thing. It was annoying! And while the names were being announced people yelled, clapped and cheered. You couldn't even hear the next name called.
While it is bothersome, I don't think people need to be arrested for it.

My Alma Mater did the Grim Reaper thing. Not while I was going there, but I heard it was pretty shocking. I believe the kids knew their classmates weren't really dead though. Boy, I hope so. That could really mess some kids up. Emotional stress!