I went to Florida when I was in my early twenties. I saw what I thought were a bunch of used, blue condoms on the beach and I was disgusted with the lack of hygiene. But it turned out that they were jellyfish.
A childhood belief about condoms

others believed things like this
- The song "Reverend Blue Jeans" turned out to be "Forever in Blue Jeans." Who would have believed that?— music lover
- I used to believe that jelly came from jellyfishAnon
- I used to think jelly came from jellyfish's tenticles— Rachey b
- My sister told me that jellyfish came out of the shower and sting you to death.— Nick (Alex's brother)
- that the green traffic light turned blue when it was off— Kriket Evens
- When I was 10, I thought that nausea was called Lack-O-Candy Disease. My mom made it up— Teddybearhaha