It would seem that the passenger brief is very much underplayed by instructors and examiners alike. I have had two examiners stop me mid-sentence while trying to demonstrate the seatbelts and emergency exits. "I know how to put on a @#$% seatbelt son, can we get on with it?" Its true most of us should know how to operate the seabelts, door latches, and use caution around propellers (spinning or otherwise) But our passengers may not know the first thing about airplanes. If you don't think someone could walk into the spinning prop on your next flight you're either flying a jet or you've got, dah,dah,daaahhh........a hazardous attitude. guess which one.