On the other hand, I've recently seen a wall painter balance on a thin and wobbly piece of wood stretched over a stairway (if he falls, it's going to be about 4

On the other hand, I've recently seen a wall painter balance on a thin and wobbly piece of wood stretched over a stairway (if he falls, it's going to be about 4 meters down and onto concrete stairs). That was apparently necessary to reach some parts of the ceiling. I wouldn't be surprised if electricians or plumbers had to do to this kind of (to me) completely crazy shit from time to time.