I never realised that you could breathe through your nose, until I saw my dad breathing without opening his mouth. I was really shocked and exclaimed, and everyone just looked at me confused.
Years later, my orthodontist said that I breathed through my mouth an abnormal amount. I always figured that was the reason.
A childhood belief about general

others believed things like this
- I used to believe that the "shark mouth" nose art painted on military planes was to scare enemy pilots away.Anon
- 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
- I thought a "cold sore" on your mouth was the same thing as "coleslaw" and so avoided eating it for years.— Helen (UK)
- i used to believe that if you farted out of your mouth, you'd die.— John Deere
- i used to believe that dragonflies would sew your mouth shut.Anon