I used to think that orangutans were pronounced orange-oo-tins, not o-rang-uh-tangs. I'm embarrassed to say, I was in my 20's, had just taken my kids to the zoo and was telling my niece (using my scholarly attitude) that my favorite was the orange-oo-tins. Never live that one down!
A childhood belief about general

others believed things like this
- I thought "Orange is the New Black" was about wearing orange to funerals.Anon
- that red and orange were different shades of the same color— Larry
- i used to think that farts came out as a little orange cloud.— mh
- My dad told me that in Florida, snow is orange.— Belle
- I used to believe that if you ate too many carrots your skin and hair would turn orange. — Mariah
- When I was little my parents used to tell me and my sister that carrots were "orange candy." — Nancy