That's the conclusion I draw from the fact that there's a seat belt demo unit in the seat-back pocket in front of me.

If I could demo any airplane safety technology to the rest of the passengers, i'd choose the breathing masks that, I'm told, will fall from the ceiling in the event of a MUMBLE. The stewardesses who always demonstrate that device never give a very convinvlcing performance. I think I could better represent the terror that a passenger would feel at such a moment.

"I've pulled and pulled, and the bag just won't inflate!"