It's not mine, but when my dad and his brother and sister were little, he and his sister used to tell their brother that he was adopted, because he had red hair and blue eyes (the rest of the family has brown hair and brown eyes) and because he was left handed. He believed them for a while, until he asked his mother if he was adopted.
A childhood belief about family

others believed things like this
- I was born brunette with brown eyes and dark hair, i thought people with blue eyes, had water in them.Anon
- My mum told me and my brother that we were adopted and that our real mothers were witches. Thanks mum.Anon
- I used to believe that my eyes were brown because I ate too much chocolate. Thanks, Dad!— Christine
- Drinking coffee before your 12 yrs, old will make the white in your eyes turn brown.— dawn b.
- I used to believe that white people had white poop and that mine was brown because I was brownAnon
- I used to hold my hand over my hair whenever i left the house and it was windy incase my hair blew away— lisa