PN,
You and most PPRuNers are the exceptions. From my experience pax's don't care for the instruction and you can see this next time you travel check how many people look at the safety brief.
Hava a look at
safety cards, airline safety, illustration, evacuation, instructions, procedures, Airtoons - index and see what people make of the safety brief. (sorry I don't know how to insert a link properly),
F3G you must travel much more than me because when I travel, the crew make the announcement as the aircraft starts to move under its own power.
In any case if you care either ask the crew or read the safety card.
Rwy in Sight