When I was about 4, I flushed a bouncy ball down the toilet.
The next day, after a weeks worth of rainfall, a nearby town was flooded, and when I saw this on the news I blamed myself for this incident.
I wouldn't let go of the guilt the pained me for the next two years.
A childhood belief about general

others believed things like this
- I used to believe that it rained worms, because the sidewalks were always covered with them after a rainfall.— Miss Naive
- 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 there where dead people in the bases of bouncy castles.Anon
- I used to believe that the toilet would suck me down if I flushed it.— :-)