My only real worry is that, in the (unlikely) drop in cabin pressure, when I pull the mask to start the oxygen flowing (see, I do listen to the pre-flight briefing...) the little transparent plastic hose will snap and I'll end up looking blankly at a stupid yellow mask with said hose hanging desperately down, wondering if the principle of survival of the fittest justify my grabbing hysterically the mask of the fat woman sitting next to me, while jabbing my fingers in her eyes to keep her from taking it back.