When I was a little kiddo, I used to think that semen was another word for spit, like salava. When I asked my mom where I get my semen from, she was horrified. (mainly cuz i asked it during her lunch with her friends)
A childhood belief about reproduction

others believed things like this
- I thought that Siemens was a factory where they manufacture semen for the bodies.Anon
- I used to think that spam was semen so I was very confused when people talked about buying it in tins.— EB
- My sister used to think that "spit" was a bad word. She meant "shit".— "Spit!"
- i used to think the word "friendship" meant a special kind of rocketship that you went on with your friends.— chips ahoy!
- i used to think that the word "stupid" was a curse word, ranging in scale right beside the "f" word.Anon
- I used to believe that big grasshoppers would spit tobacco at you if you got too close to them.— Uni