I used to believe that when tieing knots in rope that the more normal knots you "stacked" on top of each other the stronger the knot would be
A childhood belief about physics

others believed things like this
- I believed that I had invented reef knots.— Phil
- When I was younger, I used to believe that the boogey man would tie my hair in knots at night.— Jasmine
- .. the knots in wood would turn into dinosaurs. I was petrified of pine cladding.Anon
- My parents said that gnomes tied knots in my hair while I was sleeping. I had insomnia for years.— Daria
- I used to believe that eating chocolate laxatives made you stronger,don't ask me why.— pat
- I used to believe your belly button was a knot that held you together - my parents had wierd anatomical views— anne