2. If some day you get stuck in an elevator. In such a situation, the first thing you have to do is to get on the floor and lie on your back.
Then place one arm directly under your head in order to reduce the impact of the blow when the elevator hits the bottom.
Put your other arm over your face to protect your eyes and face from the debris which could fall on you. Keep one arm over your face and other underneath your head firmly.
Do not jump, or do anything else. You could put your life in danger. Just follow the above two steps.