When I was in first grade, my teacher had drawings of characters based on the letters of the alphabet hanging on the wall over the windows of the classroom.
The one I remember most was Munching Mouth because one day my teacher put her hand to her ear and said that Munching Mouth just said he had an idea. At the exact same time she did this, some people had passed outside the window talking. For years afterwards, I actually thought I had heard Munching Mouth speak to her.
A childhood belief about teachers

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
- 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 think people had a "potty mouth" if they had been drinking out of the toilet.Anon
- 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