Not really a belief, maybe it is. When I was little I used to pee underneath my slide in the backyard, because I thought that if i went inside, my outdoor toys (slide, swings, sandbox, etc.) would vanish.
A childhood belief about toys

others believed things like this
- I used to believe that if you drove over a banana peel the car would slide off the road.Anon
- I used to believe toys came alive at night.
Because I love toys, and I hoped be good friend with my toys.Anon - When I was in kindergarten, I was convinced I could dig my way out of a sandbox and off to China.Anon
- That if you went on the swings right after you ate, you would get chicken pox.Anon
- When I was little I use to belief that if we swallowed the pit of a fruit, a tree would grow inside us.— Maya
- I thought that islands and continents were floating rocks so you could swim underneath them.— Kat