When I was about 7 my older sister (13) had one of those little tiny flies go in her ear and she couldn't get it out. My Mom took her to the hospital and when they came back they told me that the doctor took a hose and sprayed water in her ear and the fly came out the other ear.
I not only believed this but I told people this ACTUALLY HAPPENED until I was 12 or so. I didn't get that it was a joke until even later.
A childhood belief about general

others believed things like this
- My Sister Used To Believe She Could Fly By Driniking Water From A Magic Forton. I Told She Couldn't.— Zoe
- My older sister told me squirrels were poisonous, and I believed her until I was 9.— Jenni
- when i was 4 i believed i could breathe under water, one day i decided to try it and woke up in the hospital!Anon
- my uncle was a doctor, so when he told me his vw could fly, i believed.— boodles
- when i was really young, i couldn't figure out why i can't get older than my older sister.— angela
- i would never eat biscuits with currants in because someone told me they were flies.— ahab