Based on close observations of sweater topology, I used to believe that there were two varieties of adult female bosoms, one kind with two separate breasts, and another kind with one horizontal breast from one side to the other.
A childhood belief about rude bits

others believed things like this
- I used to think dildos was a kind of spanish rice based on it's placement in La Vie Boheme — RENThead
- I used to believe that teletubies where a kind of aliensAnon
- I used to think that a gherkin was some kind of piece of machinery. I wonder where I got THAT from...— Some Idiot
- When my dad was little he thought that mistletoe was some kind of aircraft.— xoxo
- I used to believe that Viagra was another kind of allergy medicine.— RandomPerson0008
- I used to think "firecrackers" we're some kind of really spicy cracker.— MAG