I used to believe that when actors and actresses kissed each other their lips weren't really touching. I thought there was some kind of camera trick that made it look as if their lips touched.
A childhood belief about films

others believed things like this
- When I was little I believed that when I put lipstick on my lips, the lips grew.— Alba Águila Castelló
- when i was about 7 years old i once thought that chickens had lips. thats it!Anon
- I used to believe that dragonflies could sew your lips together so that you couldn't eat. — Lori
- The old classic by the Go-Go's "Our Lips are Sealed" I used to think they said "honest I see you"— Euge
- When you lie your lips move or your eye turn green— Tanya
- I used to beleive that (like your teeth do) your lips would fall off so new ones could grow.— Queen Ohla Quads