I flew with a purser that tweaked the announcements considerably. While demonstrating the seatbelts he announced"For those of you that have not been in a car since 1970 we will now show you how to fasten a seatbelt" .When it was time to demonstrate the lifejacket he said" in the event of an emergency please remember that they are property of XXX airlines and should be returned at your earliest convienance".I think it was the ONE flight that all the pax paid attention to the safety demo!