What to do when you are trapped in a lift?

got this from a friend... good to refer in case:

First - Quickly press all the different levels of buttons in the lift. When the emergency electricity supply is being activated, it will stop the lift from falling further.
Second - Hold on tight to the handle (if there is any).. It is to support your position and prevent you from falling or getting hurt when you lost your balance.
Third - Lean your back and head against the wall forming a straight line. Leaning against the wall is to use it as a support for your back/spine as protection.
Fourth - Bend your knees Ligament is a flexible, connective tissue. Thus, the impact of fractured bones will be minimised during fall.