Having said all of this I do think that the "in the event of a sudden loss of cabin pressure" announcement should be amended slightly to say that "masks like this will drop out of the overhead panel and the plane may descend suddenly with no notice from the pilot; place the mask over your face and mouth before helping those beside you ..."
This is because every time we have a depressurisation story there is talk of planes plummeting out of the sky and people don't seem to get that this is perfectly normal procedure. And obviously the pilot isn't going to say anything as he is too busy trying to save everyone's lives!