i used to believe that sharks could somehow get into our swimming pool as babies through the 'pipes'. i believed that they could somehow lurk undetected in our pull until fully grown, when they would surge out of the shadows and attack me. (this was a result of seeing jaws as a very young kid).
A childhood belief about swimming pools

others believed things like this
- I believed that the ladder on the back of a trailer/rv led up to a swimming pool.— marilese
- Up until I was in 3rd grade I believed my bathing cap is what kept me afloat in the swimming pool! Anon
- i used to believe there were invisible sharks in the deep end of the pool, thanks to my older brother.— Melissa
- I used to think that a "pool shark" was an actual shark that lived in a swimming poolAnon
- when I was a child I thougt taht sea waves are the result of whales swimming— waleed bokhari
- I used to believe the shadows on the moon were actually spacemen casting shadows on the ground.— Perry