I used to think that in the Catholic blessing that my mom says at dinnertime, she was thanking God for giving us the food "from thy bound teeth," and couldn't make any sense of it for years. I still think it sounds like that. (It's "from thy bounty," for those of you who aren't familiar with it.)
A childhood belief about prayers

others believed things like this
- I used to believe that eating burnt toast would make your teeth whiter and would brush your teeth for you.— Natasha
- I used to think that if someone looked familiar to me then I must also look familiar to them.— Preston
- Until I was around 8 or 9 years old, I thought dentists took your teeth out and replaced them with new teeth.— Verapamilo
- I used to think dogs had hooves, because they make hoofbeat-like sounds when they walk.— Samuel Lamont
- I thought it was impossible for anyone to lift more than their own body weight. Just seemed to make sense..— Xenomorph
- I used to believe that if I didn't brush my teeth at night, ants would crawl into my mouth and eat my teeth.Anon