A friend of mine used to believe that when she went swimming her period would stop automatically (for the water around her didn't turn red), so she would go swimming daily without a pad or tampon or anything while she was having her period! Gross! (It made me remember how when you play freeze tag to unfreeze someone you have to swim between their legs). I made a mental memo never to go to the pool with her again!!!
A childhood belief about swimming pools

others believed things like this
- I used to believe that the waves in the ocean were made from whales swimming by...— Tina
- 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
- I used to think that a "pool shark" was an actual shark that lived in a swimming poolAnon