When I was maybe 4-7 I thought that you only had as much blood in your body as you were born with, and you could never make more. I was quite afraid of bleeding, since I thought that my body's blood supply was slowly being depleted and if I got too many scrapes I would soon die.
A childhood belief about general

others believed things like this
- I used to think that instead of bones and blood and tissue that you body was made up of tuna.— m.n
- when I was young, I heard that blood had iron in it. I thought blood was red because it was rusty.— Hunter
- I used to believe that guns shot out blood because everytime somebody shot a gun in a movie you saw blood.Anon
- I thought it was impossible for anyone to lift more than their own body weight. Just seemed to make sense..— Xenomorph
- I used to think that "extra body" shampoo meant you could use the runoff suds to clean your body.— Christy
- I thought the blue veins in some cheeses were actually blood vessesls!— Helen