I remember when my sister was about 5, she would not fart in the tub. She thought that it would form a smelly-film on top of the water that would kling to every inch of your body when you were ready to get out of the tub.
A childhood belief about farting

others believed things like this
- I once told a friend of mine that if you held in a smelly burp, it'd turn into a fart. She believed me.Anon
- I used to believe that lizards were little dinosaurs ready to enlarge of they touched the water — Mark
- I used to believe that an animated film meant that the film had live animals in it.— reverb
- When I was little, I used to believe that people REALLY DID need a pinch to grow an inch.— Marjorie McNaughton
- i used to believe that everytime you hiccupped, your pine shot up an inch; making you taller— adria
- When I was little, I thought the singular form of geese was "gee"— Kate