When I was about 7 or 8, one of my friend's older sisters had a doll whose hair would change colors based on the temperature of the water inside the doll's hairbrush. She told me that this also worked on humans - hot water would yield blonde hair, cold water would make you a brunette, and lukewarm water would change you to a redhead. Since I was a "Little Mermaid" fanatic, I longed to have red hair. I brooded over this for months until I finally asked her if I could borrow the hairbrush to use on myself. She then confessed that she had been lying.
A childhood belief about toys

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
- I didn't think you could put out a fire with hot water - only cold water would do.— Katti Pytt
- When I was a kid I took two showers becaue I thought my hair was a plant and needed the water to grow— Tim
- I used to believe that hot water was red and cold water was blue.Anon
- When I was younger I cut my Barbie doll's hair and wondered why it never grew back.Anon
- I thought that hydrogen was pure water (since I knew hydro- meant water) and H2O was impure some how— Hexetic