I didn't know what a toilet plunger was used for. But I remembered seeing in a cartoon once that a character ran around with one stuck to his face. So that's exactly what I did.
You can imagine my reaction when my dad told me what a toilet plunger was actually used for!
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
- i used to think that popstars didn't go to the toilet! LOL!— hello