I used to believe that if I breathed through my mouth too much my nose would stop working and I wouldn't be able to breathe through it ever again.
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 farts were air you had breathed in and out loads of times and was 'used'Anon
- i used to believe that if you swallowed gum, when you breathed in, your stomach would stick to your back— cope
- I used to believe that if I pumped in my sleep and breathed it in I would turn into a rotting turnip!— Quako
- I thought everyone only had a set number of breaths before they died.
I breathed slowly for a long time.Anon - that sneezes were caused by little pixies crawling up your nose and brushing past your nose hairs— Joanna