I would echo all other postings so far.
I always get the pax involved on the walk-round, pointing out such things as:
"two fueltanks, two fuel pumps, two electric systems for added safety - if one fails the other automatically takes over".
I also offer to fly a circuit for someone who is "not sure" - we can land after the circuit if they are not 100% happy - if they say eys then it is a touch and go!!!!!!!
PFO