My older brothers told me if a person did a belly flop off the high dive, their stomach would split open. They said they actually saw this happen at the local pool - blood and guts floating in the water. I never got my swimming certificate that year, because I refused to jump off the high dive!
A childhood belief about swimming pools

others believed things like this
- I used to believe that all the first names of judges was Justice till I was doing my 4th high school year.— Tafadzwa
- I used to think that a "pool shark" was an actual shark that lived in a swimming poolAnon
- I believed that the ladder on the back of a trailer/rv led up to a swimming pool.— marilese
- I used to believe that if you farted while swimming in the pool, it could propel you foward really fast.— Rick
- Up until I was in 3rd grade I believed my bathing cap is what kept me afloat in the swimming pool! Anon
- When I was a kid I used to think the "carpool lane" was an actual pool cars went swimming in— skeez