[Hugh R]

True story, many years ago (Ok, not that long ago) I installed a ceiling fan in my office in the house. It had a long pull chain and a weight at the end of the chain (that I hadn't put on yet). I pulled the chain and let go, the chain popped up into the moving blades, and caught and the fan, which kept running and it unwound from the pole it was on in about two seconds and fell to the floor. I hadn't (yet) put the locking set screw into the the fan where the pole screwed into it either.