Christiaan,
My experience tells me that NOTHING anyone can do will make the majority of people "watch and listen carefully". because air incidents, especially major ones, happen rarely, people (rightly) feel very safe travelling on aircraft, which leads to complacency...
The major difference in thinking about saftey between crew and pax, in my opinion, is that while safety is at the FOREFRONT of crew's mind, for most pax saftey is somewhere in the BACK of their mind ( and rightly so). They think about it once or twice when getting on a plane, then forget about it all, while we , as crew think about safety ALL of the time.
Happy flying!
B