This one in not mine - it belongs to the boy I used to babysit: We were riding one hot day and I told him we needed to turn off the air conditioning because I was almost out of gas. He later explained to his father that the air conditioner of a car ran off a separate gasoline engine and you had to put gas in it, too.
A childhood belief about cars

others believed things like this
- I once told a friend of mine that if you held in a smelly burp, it'd turn into a fart. She believed me.Anon
- one of my friend's was told by his father that if you didn't turn mirrors over the reflection would run out.— pri
- I used to beleive that gasoline was made from dinosaurs.Anon
- I used to believe that rocket ran on gasoline and that in order to save gas, we should end the space program.Anon
- I used to think that conditioner was to wash the shapoo outAnon
- I used to think that the engine in a car was only to create a noise to warn others of its arrival— mudspanker