And then ...
My own experience (from that thread): -
Back in the late 90's I was working in Hong Kong on the airport express line (just before Chek Lap Cok-up opened). A Chinese guy was having a hell of a time drilling a wall to put up some sort of signage. Yes, he too had the drill in reverse, never had the heart to tell him (face and all that) but when we were back at that station two days later the sign was sitting forlornly on the floor, it could be there to this day.