When I was little I used to believe that when you switch off the TV the film you were watching stops exactly there, and you can watch the rest of the film by switching on the TV again (even on the next day or so!).
A childhood belief about tv

others believed things like this
- I used to believe that an animated film meant that the film had live animals in it.— reverb
- 'To Be Announced' in the TV guide was a film that was on all the time!— Clare
- I used to think that a Mormons were an alien race from a fifties sci-fi film.— Katherine
- When a grown-up is shown as a child, it was actually them, and the film took 20+ years to produceAnon
- I used to beleive that in order to rewind a film the actors would have to re-act the whole movie backwards. — movies backward
- my friend thought that the film 'the hulk' was about the jolly green giant from the sweetcorn adverts.— patticus