I first saw this video in the mid nineties.
Scene shows 3 or 4 FF just standing around on the roof. Doing nothing. Finally they get on a ladder to climb down and within seconds of the last guy getting on the ladder the roof collapses. Basically the instructor was saying if you have a job to do on the roof do it and get off.
I need to pass this onto a friend of mine to hopefully save somebodies life.
(not sure its gonna help ... SMH)