Everyone has belived silly things as a kid, post some of yours!
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When I was little, I belived there were 2 seprate mail vehicles, the normal mail truck, and then a junk mail car, wich was a red convertable drove by 2 people in their 20s that delivered junk mail all around the world, like santa, if santa cane every day and put junk mail in your mailbox. I have no idea why I belived this, I jusg did.
That I could fly using my umbrella!
I'm guessing you possibly watched Mary Poppins and it stuck?
That my mom must love me and want me because I was her child. At age six she’d told me I was a mistake and when she was told she’d have twin boys she was happy again. I’m a line girl. And 40yrs later at age 46 I still feel the hurt.