I thought Sperm Whales and Semen (Seamen) were in some way related.
A childhood belief about reproduction

others believed things like this
- I thought sperm were fish and when I got a goldfish I went around telling everyone i had a sperm— Kara
- I used to believe that all my aunts were related to my mother and all my uncles were related to my father.— Mandy
- When I was young I refused to drink well water because I thought it came out of whales.— itodd
- I thought that Siemens was a factory where they manufacture semen for the bodies.Anon
- I used to believe that the waves in the ocean were made from whales swimming by...— Tina
- Waves are whales and sharks moving up and down under the waterAnon