I used to think that the second exhaust pipe on certain cars was for the sick to flow out of when somebody had vomited in the car. Don't ask me how the sick reached the pipe!
A childhood belief about cars

others believed things like this
- I used to think a drain pipe in my backyard led to another world.Anon
- I used to think that my dad was "smoking pot" when he would smoke his pipe while sitting on the toilet. Anon
- I thought Pink's "You make me sick" was "you make me sick, you make me look like a candlestick" LOL— Rice
- I used to think that cars were powered by a jet of air which came out of the exhaust.— BadDeal
- I thought that people were like cars because cars have exhaust pipes, and people fart.— Matt
- I used to believe that cars were propelled by their exhaust like some kind of rocket.Anon