In 5th grade, I had a health test, and one of the questions was "How many hours of sleep per night is it recommended a human try to get?"
Rather than look up the answers in the book while studying, I asked my dad, to which he said "13", joking of course.
I put this as the answer on my test, which I obviously failed. When getting my graded test back, outside of the hours of sleep per night question, my teacher had circled "13" and in bright red markers added "Is this why you are not doing well in school????"
A childhood belief about classes

others believed things like this
- everybody else were robots and I was a human test!
— Chas - In kindergarden my friend told me that there were 24 hours in the day and 15 hours in the night.— Cari
- I used to believe that whenever I got an F on a test it stood for fantastic. — megan
- If you pick Dandelions then you wet your pants. Honestly...I've never tried and I'm not going to test it!— Charlene
- i used to believe you slept for 100 hours every night.— skye-ness
- I used to believe that moths circled lights at night trying to find a way out of the world!— Diane D.