I watched a lot of cartoons as a kid, and some of the older cartoons make references to "rubbers." I always thought they meant rubber galoshes, so when a cousin finally explained that men wore rubbers during sex, I couldn't help but wonder what use galoshes were.
A childhood belief about condoms

others believed things like this
- I used to think that "cross-eyed" meant that people had X's for eyes, like dead people in cartoons.— Tim
- I thought live-action films were very, very well-drawn cartoons.Anon
- I thought cartoons were for kids and "real-life programs" for adults.— Ichigo
- I thought cartoons were real, I remember asking my mom why there were lines around the "actors" in a cartoon.— Steven Graziano
- Because of cartoons, I thought that to drive you'd just turn the steering wheel back and forth constantly. — Mitsuki
- i used to belive in cartoons— morgan