Heard a guy about six months out of undergrad once declare (completely serious) that of course he knew how to run a school district, he attended public school!
Wow did that make me distrust every suggestion he made.
Hahaha. As an undergrad in my University, I asked a guy just before an exam on electro magnetic waves if he had studied properly, and the guy told me dead serious, that he knows Ohm's law, and he can derive everything from it!