It can be anything!
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when I was really little i thought i had to sleep fully under my sheets on my bed in case there was something under my bed that might eat my toes. apparently, a couple layers of thin fabric were enough to stop everything. pretty sure that's kinda common, but yeah
I am not sure if this is what you were looking for but the other day I was gonna watch a movie with my family. My dad wanted to watch Anchorman, and I was like sure, I've never heard of it. I assumed it was about a guy on a boat, so j was very confused when it was about a news anchor