I used to believe that films on TV used to carry on during the adverts. So if there was a car chase, I was missing it while they showed ads for dog food. I always wanted the ads to be really short so that I didn't miss anything important in the plot.
A childhood belief about adverts

others believed things like this
- I believed that female teachers got to choose if they wanted to be called "mrs. or miss" — Jenna
- I used to turn the TV off when I left the room so I didn't miss anything.— S.Lee
- Since the girls name Jackie is short for Jacqueline, I thought the boys name Jack was short for JackalAnon
- When I was little, I used to believe that my Barbie's would come to life while I was asleep to plot my death!— Kimbre
- I used to believe that when I went to sleep, my Barbie dolls would make out and plot to kill me.— ClaireRat
- my friend thought that the film 'the hulk' was about the jolly green giant from the sweetcorn adverts.— patticus