I was in grade 10, when, in front of the whole class, while we had just "finished" the chapters on Mitosis / Meisis and Zygotes ... I asked my biology teacher, "I understood it mam, but where does this zygote really form? In the female body I presume, then how does she get MALE hormones inside?"
Surprisingly, all my friends (it was a girls school) knew about how it works, I got a stunned silence and stupid giggling after my question - sufficient to let me know I've asked a stupid questions. I got a fresh perspective in the recess that followed.
Needless to say, the teacher always believed I asked the question on pupose to embarass her and treated me accordingly.
A childhood belief about reproduction

others believed things like this
- Anytime you had a question (any question at all) you just called the president.— Erin
- I once asked my CCD teacher if eternal bliss in Heaven would get boring after a while.— Some Dude With A Name
- I used to think my elementary school gym teacher's name was "Jim Class".— Brandon Campbell
- A[n] nth grade teacher only had to finish the nth grade when he or she was in school.— MD Caruso
- every one lived until they were 100 and then they died no questions asked— sext4eva
- When a "mean girl" in early grade school asked me if I was a virgin I answered "no I am catholic."— Hilary