I used to believe that when you flushed the toilet on a train, everything was just dumped onto the track. I was always careful not to use the bathroom while the train was stopped at a station.
A childhood belief about trains

others believed things like this
- i used to believe that if you put a penny on a train tracks that it would derail it — ROSS
- For some reason, I used to believe that women only got raped on train tracks.
— Jessica Tinch - 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 think if I left the toilet seat open my cat would get flushed down the toilet.— G
- I used to believe that the toilet would suck me down if I flushed it.— :-)