There was this old episode of Kate and Ally where Chip overflowed the toilet and tried to remedy the situation with a plunger. For some weird reason I developed a totally irrational fear of plungers and would make my mom or grandmother remove the plunger from beside the toilet before I would turn my back on it and sit on the toilet.
A childhood belief about bathrooms

others believed things like this
- I thought that toilet paper was bread and by puting it it the toilet i was feeding the ducks at the bottem.— Gringo
- I used to believe that monsters lived in my toilet and they ate my poop and urine when i flushed the toilet.Anon
- I used to believe that if I flushed the toilet before I showered, I would take a shower in dirty toilet water.— Chris D
- I used to beleve when i was 4 that the flush on the toilet was to wake up toilet monsters.— Millie
- I used to think if I left the toilet seat open my cat would get flushed down the toilet.— G
- My brother (who was 6 at the time) would never flush the toilet in fear of our new house being blown up! Anon