Interesting....I've flown Young Eagles and Angel Flight in both a C172 & my cherokee 180 and I never put two adults in the back seat, just for this reason (adult and small child, yes). True, my ground is 5500 MSL and that is a major factor, but I'm surprised the CFI would do that even near sea level. Around here, the CFIs will only put one adult in the backseat to illustrate the problems (I've been that ballast more than once).My wife's instructor was doing a stage check for another instructor. The club only has 172's so he figures it's time this guy sees what a 172 at gross weight feels like. Margy and I are in the back seat. The student seems to be doing well up until he rotates. We leave the ground and the pitch just keeps going up and up. I grab my wife for fear that we are going to not make it.
It was about this time that I heard the "CFI death scream" (which is the instructions given to a student when the CFI fears his life is in jeopardy). The instructor is pushing hard against the student and the words were something like "GET THE NOSE DOWN. IF YOU DROP THIS THING ON ITS TAIL WE'RE ALL GONNA DIE."
Fortunately we got a more sane AOA and the rest of the flight was uneventful.