I've been on two planes in the last three days and I feel the safety demonstration is aimed directly at me. And my family.
In case of emergency, oxygen masks will fall from the ceiling above. If you are traveling with someone that requires assistance, make sure to secure your mask before helping them. Because if you don't, you are no good to those around you. Not only will you die, but you will have inadvertently caused the death of the person you are trying to help.