When I was a kid I used to think that the signs on elevators that said "In case of fire, do not use lift" meant never to use a lift, just in case there's a fire. I wondered why have the lift at all, if you're never meant to use it? But figured since everyone else ignored the sign, the risk couldn't be that great!
A childhood belief about reading

others believed things like this
- I used to belive if someone liftes you up, and you lift them at the same time, you will float in the air.— D'Anthony
- I thought it was impossible for anyone to lift more than their own body weight. Just seemed to make sense..— Xenomorph
- i always thought it was Grape Balls of Fire instead of Great Balls of Fire— Courtney
- I never knew why boys had to lift up the toilet seat...until my friend told me that boys had bad aim.Anon
- I used to think that being fired meant they set you on fire.
Or they just chopped off your head.Anon - I used to believe the Do Not Pass signs on the roads meant you were'nt aloud to pass the sign. I was 14.Anon