I had only seen depth markers that marked feet before, so when I went to a pool that had depth markers that said 3 FT 4 IN, I thought that the "4 IN" part meant there were four people in the pool. It didn't occur to me that I could see more than four people, and there was no way the depth markers could have counted how many people were in the pool anyway.
A childhood belief about swimming pools

others believed things like this
- Washable markers could actually be washed off of paperAnon
- I believed that the Kreepy Crawlie used to clean our pool, would follow me around the pool and eat me. — Mother-of-2
- I used to think that a "pool shark" was an actual shark that lived in a swimming poolAnon
- i used to think that you would die if you didn't wait 30 minutes to go into the pool after eating. (^^)— cady
- If you pee in a pool, the pee disappearsAnon
- Whenever my fingers wrinkled from staying in the pool too long, I thought I was aging faster.— The Mortal Elf