My belief (still) is if an eyelash goes in your eye and you lose sight of it it then goes behind your eye ball and gets stuck there (i have about 20 there now - and it panics me)
A childhood belief about eyes

others believed things like this
- I used to think volleyball was actually called "ball-y ball"Anon
- I thought when a road sight said Dead End that someone had actually died there.Anon
- I used to believe that when you grow up, you lose your given name and become just Mr., Miss, or Mrs. Whoever.— Andrew Buc
- Whenever on of my parents let one lose, they would say, "Barking Spiders!"— Ginger
- When i was child i used to believe that when i lose one tooth, a little mouse will give me some money.— Daniele
- I used to belive that kids had powers and if you didn't master them quick you'd lose them. — Oliver