I thought swallowing gum was bad because if you swallowed too much it would go to your mouth gums and eventually you would have too much gum in your mouth and you wouldn't be able to talk or eat. Part of me still thinks it's true..
A childhood belief about chewing gum

others believed things like this
- I used to think wall outlets looked like little faces (eyes and mouth), and so I would talk to them sometimes!— EJ
- I used to belive that if i put my foot in my mouth, I would get foot-and-mouth illness— Emily Sathrota
- when i was little, i thought that you could pull your eyeballs and wash them in your mouth— beak
- i used to belive that when the doctor opened his mouth and went aaaaaa i thought he was trying to eat me.— matt
- My dad use to tell me that if I swallowed gum it would plug up my bum hole and eventually I would explode,— Carrie
- I thought a "cold sore" on your mouth was the same thing as "coleslaw" and so avoided eating it for years.— Helen (UK)