Airline pilots go on CRM courses and we don't, but CRM comes in everytime there is more than one pilot in one of our puddle jumpers. I had a similar experience to Pulse1's, which illustrated the "cross cockpit heirarchy" issue in CRM. Approaching to land in a twitchy taildragger (only my second flight in that type), the hugely experienced and capable guy sitting behind me lost concentration (he had actually started to fall asleep) as we came into the flare. As we went sideways, a voice in my head told me that I should yell at him to go around, but I didn't. In the end, the only damage was to his pride. Debriefing the incident later over a beer, my friend identified this as a classic instance of cross cockpit heirarchy adversely affecting flight safety. I should have spoken up, but was deterred by a combination of knowledge of his zillions of hours and respect for his (usually) brilliant flying.
The curse of Prune was almost upon us, as it was ten years to the day since he had bent a similar aeroplane in similar circustances. So, my friend was awarded a Bar to his MHDOID and we both learned something.