I use to believe that if you left a glass of water next to your bed while you were sleeping it would get warm because flies peed in it.
A childhood belief about drinks

others believed things like this
- I use to believe that dragon flies and fire flies were fairies— lady eberly
- I used to believe that flies were called "bloody flies"!— Angelface
- I used to beleive that when I took a bath w/ my brothers, that if they peed in the water I'd get pregnant.— SabB
- I used to think when I peed in the shower as a kid, the water coming back through the showerhead was my pee.— gregg
- I used to think that Luke-Warm water had somthing to do with Luke SkywalkerAnon
- i used to think flies were little birds!— unforgiv3n