I believed that if you held up a large enough piece of paper, that if a very fast jet plane flew through it, it wouldn't make a hole in the paper.
A childhood belief about physics

others believed things like this
- I used to believe fax machines instantly teleported a piece of paper to who ever you wanted. Anon
- when my friend was little, she used to eat paper, thinking it would make her read better.— hehehe
- i believe in the tooth fairy so much that i make paper bags for her!— Monster High girl
- When I was little, I believed that clouds came from paper mills.— Ryne
- I used to think that when you sent a fax, the paper went through the wires.— em
- I use to think that mummies were wrapped in toilet paper.— Glowworm