When I was 9, my best friend's rabbit disappeared. Him and I both believed his parents' story that the rabbit had gone to a rabbit farm where it could play and live with all its rabbit friends. I found it a little odd but it was certainly a comforting thought.
My dad used to warn me if I ate too many sweets my asshole would seal shut
I thought for a while that clouds were in space and seeing them move was the earth spinning
maybe others but I forgot and it's super hard to recall these types of things on command because by their nature I don't analyse them