When I was younger I would jump in any plane and go anywhere. There was only twice I regretted getting in an airplane with a person I had never flown with before.
The first was when a pilot in our club asked me to do some pattern work with him in his Bonanza. After his first landing I sure wished there were dual controls instead of a throwover yoke.
He had been a Waco glider pilot in WW2.
The second time was a pleasure flight with three other pilots in a C172XP. To make a long story short, when we were landing at night in strong Santa Ana winds, the guy flying blew his landing and bounced. He applied full power and announced he was going around. With visions in my mind of us drifting over into the airplanes parked on the ramp and going up in a fireball, I unbuckled my seatbelt and reached over from the backseat and pulled the mixture control to cut-off. The pilot managed to keep it on the runway and had us stopped using not even half the runway. I truly feel that an attempted go-around in an overloaded plane in strong gusting windy conditions at night would have been fatal. The two guys up front were pissed at me while my buddy sitting next to me in the back seat thanked me for doing what I did.
I do believe that as I have gotten older that my aversion to risk has grown. I have turned down warbird rides that I was offered. I have felt absolutely comfortable with every warbird flight I've accepted and/or paid for. And I agree that the preflight/postflight briefing is very important.
Les