Brunswick did the same thing along with the Friday before prom they would have 5 kids be "ghosts" with their faces painted white and they couldnt talk at all and they would tag 5 more kids to be ghosts and those 5 would get another 5 and so on to signify what it would be like if they died in a drunk driving accident. It was probably my favorite day of the school year because by the end of the day half the damn school were ghosts and couldnt talk, it was amazingly peaceful.