I used to believe that when an electronic toy commercial said the "Batteries not Included" disclosure that it meant the toy did not need batteries at all to operate.
A childhood belief about toys

others believed things like this
- my nephew used to believe that when people died, they just needed new batteries.— p-daddy
- I used to believe that I could make a laser by putting more batteries in a flash light.— Tyler
- I used to think that putting batteries in your ears could electrocute your brain. Hahahaha.Anon
- I used to suck on the ends of batteries intent on gaining super electric powers. Anon
- I use to believe if I ate something electronic Id have electric powers — jack L
- I used to believe that the disposable BBQ's had the meat displayed on the packaging was included inside. — Raggamuffin