I thought that big people are necessarily smarter because there brains would be bigger
A childhood belief about general

others believed things like this
- I used to believe that people's brains differed in colours. I always wanted purple brains for some reason.— Katrina
- I used to think that I was smarter than adults. Now I know kids are smarter than adults in many ways— Marshall M
- After watching Dr Who I thought that cow-pats were rejected Dalek brains.— Middbo
- I used to think that when I ate vegetables I will be smarter.— Dark_X_Raider
- I didn't mind eating lambs brains when I was a kid because I thought it would make me smart.Anon
- I remember thinking that non-English speakers were much smarter because they could speak "so much faster." Anon