I knew what sex was, but I obviously didn't understand it because I thought the penis was simply inserted into the vagina and bam, she's instantly pregnant. I didn't know the details
I thought there were burglars hiding under my bed waiting to grab my ankles, so I would stand 3 feet away and jump into my bed.
I was scared that a rat would climb through my bedroom window like in Lady & the Tramp.
I thought that buying a house involved going to a warehouse like Costco and viewing the houses for sale as you walk through the aisles.