I was born after the event, but when I was in cub scouts, long before the internet, one of my fellow scouts' parents worked for the news station that shot this piece and brought a VHS of it to a meeting once. It became a legend at our school to the extent that the parent later gave a copy to the school to show to kids so they wouldn't be left out of the fun.
You know someone pitched the idea as a bullshit excuse to use a bunch of dynamite and everyone jumped on the bandwagon. For anyone who does not know, Florence OR is this little seaside town with not that much going on.