when I was a kid, I found a scale in my leg. I thought I am turning into a mermaid, thought about it for a while then I scratched it off. After that i regretted what I did and always thought, "I would've been a mermaid right now If i didn't scratch off that scale" turns out it was just dry skin.
A childhood belief about appearance

others believed things like this
- When I was around 4 or 5 I was convinced that you would weigh less if you sucked in your stomach on the scale.— S
- When I was little I thought that if I stayed a long time in the water I would become a mermaid.— Salma
- I used to believe that if I scratched one side of my body I had to
scratch the other to be "even".— Greg - When I was little I used to think that my mom was a mermaid because she never went swimming with me— Martina
- I used to believe that if I wet my legs in the sea I would become a mermaid.
— andrea - I used to believe that i swam more than 2 hours I would become a mermaid.— M11cazares