Have you ever been in a lift (elevator) when it went into freefall ?
I was, once (believe me, you don't want it to happen twice).
I got in on the 17th floor in our office buidling, heading for 3. As we passed the 15th floor, the lift suddenly lurched, picked up speed and just dropped ! I had always undertsood that there were emergency brakes that cut in automatically in case of a malfunction - and there must have been, I suppose, as we stopped with a hell of a jolt between the 2nd and 1st Floors.
They had to winch the cab back up to the second floor to get me out (I was on my own). I nwas asked if I was all right and I told them "Yes - except for my wits - as in frightened out of them !" It took about 3 or 4 weeks before I would use the lifts again, preferring to use the stairs.