When I was small I used to believe that if you peed in the swimming pool the water turned black and the life guard kicked you out. Unsurprisingly I haven't peed in the pool since.
A childhood belief about weeing and pooing

others believed things like this
- My big brother told me that if you peed in the pool, it would turn purple and chase you.— Elizabeth
- my aunt told us there was a special chemical in the pool that would turn red if we peed in it.Anon
- 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