My Grandpa told me to never fall asleep in a car because I'd die from the carbon monoxide. While this could be true with a massive degree of CM poisoning, he made it soudn like just falling asleep would kill me!
A childhood belief about cars

others believed things like this
- When I was a child i used to believe that if i did not fall asleep an elf would come for me Anon
- I used to think that when my arm would fall asleep that it was raining inside my armAnon
- when i was a kid, i used to think that if i didn't fall asleep, morning wouldn't comeAnon
- Whwn I was about 6 I used to think that if a crow bit you you would fall asleep for 100 years!— Lisa
- I used to think that serial killers were "cereal killers" and would kill you by poisoning you cereal.— Jello
- I used to think that a clown lived under my bed and tried to eat me while i was asleepAnon