I used to believe, after watching "The Blob" at a young age, that having nothing touch the floor (i.e.- my bed covers) would keep it from oozing onto my bed at night. That fear diminished, however, during the winters, since the Blob couldn't survive in the cold.
A childhood belief about films

others believed things like this
- I used to believe that if you slept with the covers covering your neck, vampires couldn't bite you. — Moot
- I used to believe that if i took the covers off at night i would freeze to death.— RockerGirl
- After watching a crazy TV show, I believed that aliens were real. I still have a little fear of them. — Niki005
- I used to believe that it was impossible to survive cancer.Anon
- I believed that the astronauts from the Challenger disaster managed to survive by diving into the sea.— Claire
- I thought the lyrics to "Don't fear the reaper" were "Don't fear the reefer"— who new?