When I was young I used to believe that the A La Cart Kitchen really did heat things up. In fact, I was 20 years old before I was told it didn't cook at which point I realised that small children and hot things probably don't go well together.
A childhood belief about toys

others believed things like this
- i used to believe that parents do things to make there children happier. well i was wrong. — Emma C.
- My mum told me that cold custard (which I hated) was in fact Banana Blancmange. I lapped it up for years.— Chalky
- I used to believe that the tooth fairy was some weird old guy with a hot dog cart.— Matt
- I used to believe that you could pass things down the telephone.Anon
- I used to believe that when you lost things, it sometimes was because they had really vanished. — fluffy
- I used to think that when you get older you could go back and redo things. — cobra