I believed that when you farted, bubbles came out from your bum. And I couldn't figure out how come there were never any just hanging around. And then one day I figured it out! The bubbles were popping on our clothes (underwear), of course! It made total sense.
A childhood belief about farting

others believed things like this
- I used to think when you farted, bubbles came out.— Nick
- If i farted in the tub the bubbles would be different shapes.Anon
- I used to believe the fishs are washing clothes under the ship when it moves because of the bubbles— jeff jefferson
- I used to believe that eyes where just like bubbles and if you where to touch them they would pop.— Adam
- I used to believe that if I swallowed gum I would bubbles when I 'trumped'.Anon
- Because i could not see them, i thought my farts came out as green bubblesAnon