I used to believe that you could squeeze jumper cables with your hands to jump-start a car (with one end attached to the car battery, of course). I guess this belief started when I saw Vicki the Robot do it on "Small Wonder."
A childhood belief about cars

others believed things like this
- I used to think that if I was swinging on a swing fast enough, I could jump off it and start flying.— Nick
- I used to believe planes flew by being attached by strings like a kite.Anon
- I used to believe that drinking vinegar would turn you into a robot.Anon
- I used to believe that China was attached to the United States somewhere up near Washington state.Anon
- When I was a kid I always thought that a water tower was the robot from the TV show "Lost in Space".— sherryj
- My Dad told me that biting my nails would result in a large toenail being attached to my stomach lining.— LindaAG