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????"

Anon

When I was in kindergarten, I used to believe that they locked the teacher's in the teacher's lounge at night.

Anon

When I was younger and we were learning about the world, they showed a map of the world. I always believed that the map only showed one side of the world and I could never understand why I couldn't learn about the other side. Now I'm disappointed that I've learned about the earth and there's no new land.

Anon

I used to believe when teachers asked you to 'double-space' your essay, they literally mean to put two spaces between each word.
I used to get really frustrated that my word processor only double-spaced LINES and not WORDS and I would do it manually! Strangely, none of my teachers actually noticed the lines weren't double-spaced!! Talk about misleading!

Silly

When I was little I thought that your age was what grade you where in, so when I entered first grade when I was six, I was so confused.

Anon

I remember when I was about six or seven that I had my first day off from school as I was sick. Lying on the couch all day and watching nothing but cartoons seemed like a great life to me! So after that I always wanted to have more sick days. One day I came up with the brilliant idea while having a little bit of my older sisters Pot Noodle (a noodle like snack for those not in the know, that I was never allowed to have at the time) that I could pass it off as vomit. I had a mouthful one day and kept it in my mouth without swallowing and walked up to my mom who was watching TV and promptly spat out my mouthful and then groaned that I felt sick. Of course she didn't believe me and was furious with me for spitting food on the carpet for no reason at all.

jaycob

I used to think that the color orange was called pink, the color pink was called purple, and the color purple was called orange. Unfortunately my twin brother was messing with me when we were doing our school work when we were in preschool. I thought that until I was in first grade and my teacher had to spend quite a bit of time convincing me that I had the names wrong.

Really Nick? Thanks

I used to believe that I was the only person in the world who could slouch. Sitting cross legged in class I would hunch my back over and feel superior to my classmates. I was crushed when one teacher took a special interest in teaching me posture.

Huncher