Originally Posted by GoldenRivet

my preflight briefing for passengers who have never been in small aircraft includes

1. How to operate the door for closing and opening
2. how to operate the safety restraints for buckling and unbuckling
3. how to operate any emergency equipment which might be onboard (fire extinguisher chiefly)

and one very important final addition

"...put your feet flat on the floor, put your hands on your knees, and dont move your hands or feet from that position without first asking me... are you comfortable? good... enjoy the ride!"

the most benign looking buttons and switches and levers can be the most critical in an airplane.