This isn't my moment but it's another friends.
We were learning sex ed in about fourth grade, and the teacher was explaining about condoms. My friend misunderstood and thought the guy puts a plastic bag, like from a grocery store, on his thing! We were trying not to laugh so hard.
A childhood belief about condoms

others believed things like this
- I thought brown paper grocery bags would fit more than plastic grocery bags.Anon
- i used to believe that condoms were thing that u put in your mouth and they would melt and kill all the spermAnon
- A[n] nth grade teacher only had to finish the nth grade when he or she was in school.— MD Caruso
- I used to think that doctors added plastic to your face in plastic surgery.— caro
- I used to think that plastic surgery actually involved using plastic.
— JohnJ - I used to believe that plastic surgery was done with plastic knives.— Vicki J.