I particularly enjoyed having to teach a lesson about pressurization in my CFI ground lab that was full of Riddle kids. They proceeded to TEAR me apart. "How dare you not know how to operate the pressurization system on a Triple-Seven seeing that you will be instructing in a 172!"
I have to teach 30 little kids how to read and write during the day so I could afford to pay for my flight time. That means no time for reading about the systems on a plane that I will probably never fly. I ended up getting my CFI before all of them and I even had two of them as students. Funny thing is, they sure knew a whole lot about a Triple-Seven, but they didn't know crap about teaching and they couldn't fly a 172RG worth a hoot.