When I was around 10 I saw an ad on the side of a bus that said "use condoms", but I read it as "used-condoms". So over the years I tried to understand this concept of "used condoms". I imagined it was only in San Francisco(where I saw the ad), maybe it had to do with AIDS, and why does no one else know about "used-condoms"? I saw a news report on condoms being passed out on the street in San Francisco of course I assumed that it had to do with "used-condoms". So as I got older and understood the usage of condoms I could never ever understand WHY I saw a sign that read "used condoms", and I just forced the question to the back of my mind. Untill sometime in my early 20's it surfaced and I realised,"OH- use condoms, NOT used-condoms". I had even started using condoms at the age of 13!, and still couldn't understand why I saw that ad. I laughed my head off!
A childhood belief about condoms

others believed things like this
- i used to think that condoms were gum and i tried to buy one once when i was about 8! — silly
- i used to think condoms were for your ears!— Hanky
- i used to belive that condoms where chewing gum— condom chewer
- i used to believe that condoms stopped a mans wee getting out while having sex.— a boy
- I used to believe you had to stretch condoms over you testicles.Anon
- I used to believe condoms looked like bandaids.— Kelly