I had a babysitter in grade school who I asked why viens my are blue if my blood is red. She told me this was simply because y mblood was blue in my body but became red the instant it was mixed with oxygen. This made plenty of sense because bruises, which I classified as cuts under my skin, were blue too.
A childhood belief about general

others believed things like this
- Eifel 65 - Blue
I'm Blue (if I was green I would die...)
[I'm blue, da ba dee, da ba di.]— Matt - You know the eifel65 song "Im blue da be da ba di"
I thought he said "I'm blue I'm in need of a guy"— Anna - I used to believe that if you mixed red, blue, green, and yellow paint you'd get plaid!— Judith Ann
- The song "Reverend Blue Jeans" turned out to be "Forever in Blue Jeans." Who would have believed that?— music lover
- I used to think that blood was blue until it touched air.— paetrw
- I thought the blue veins in some cheeses were actually blood vessesls!— Helen