On one of our flts a female pax out of BAH decided to undo her seat belt. After crew had done a check after signs were put on.
The aircraft entered the rough bit. This person got launched into the ceiling & back down onto the arm rest. Broke her pelvis. Apparently their was no truth to the rumour that one of the cabin crew told her. Serves you bl*** well right.
Really there needs to be more education on use of seat belts but I guess you will always get one or two who know better & have the attitude. "You can't tell me what to do"