I used to believe that Jesus lived in the bathtub drain in my parents' bathroom.
No reason why. I guess he liked it.
I used to think when an airplane ran out of fuel, it stayed stuck in the sky.
I used to think that the faces on Mt. Rushmore was a natural phenomenon. Of course, I grew up in Canada so it wasn't like they bore resemblance to the guys on my money.
When I was little, I would bike past the City Motor Company on my way to the library. However, I thought it was the City MURDER Company. I was scared to go past it for years.
I thought Heaven was some kind of trailer park in the desert near Las Vegas that people moved to when they got old.
Me and my sister used to think that our ankles were rocks and we asked my mom how to get the rocks out of our feet.
I used to think that the term 'Prima Donna' was actually 'Pre-Madonna',
i.e. a singer who makes pop music in the style usual before Madonna
My friend Becca believed that if you held your breath for long enough, the pores on your forehead opened up to allow you to breathe - she nearly passed out!
I used to believe that when you could see your breath outside in the cold, you were making clouds. So I would breathe out a lot to make as many clouds as possible :)
Until i was 8, I believed that, If you didn't have a chimney, Santa Clause would come in through the toilet.