It's mostly a design failure once again, not a "stupid user" failure. Those masks look like they should go over your mouth and like they would be uncomfortable

It's mostly a design failure once again, not a "stupid user" failure. Those masks look like they should go over your mouth and like they would be uncomfortable to put over both of your mouth and nose. If it had a longer shape as opposed to a round bowl shape, I bet most people would use it correctly, without even ever having to listen to the flight attendants. EDIT: Apparently almost everyone said the same thing I did replying to that guy's tweet. It just seems so obvious to me at first glance that the design is wrong. You can't "think" because of the high-stress situation and lack of oxygen. So the design should minimize the amount of thinking needed. People put it on their chain because the design of the mask most resembles the form of the chin not that of the mouth+nose.