For some reason, I was incredibly afraid of the urinals in the infants (age 4-7) section of my primary school, particularly the automatic flushing thing they would do. I think I believed that they would flood the place, and it would fill up with water.
For some of my first year there, I refused to go in alone, until I wet myself as a result of that policy. I was still scared of them for a while, though, despite being fine with other urinals - in fact, once in year 5 the junior toilets were being cleaned or something so I had to use the infant ones - even with the knowledge that the urinals were not, in fact, out to get me, I was still somewhat suspicious of them.
A childhood belief about fear of

others believed things like this
- I believed the urinals in port-o-potties were sinks.Anon
- I was scared that if I peed too much, the toilet would flood— scarlett
- When I was in elementary school I use to think that teacher lived at school at their desks all year long.Anon
- i thought that if water towers fell the city would flood. So everynight i would stay up worrying.— o.O haku
- In primary school, a whole bunch of kids including me believed that watermelon seeds contained ants. — Caff
- Abba - Happy New Year
"Kangaroo year,
Kangaroo year..."— Santa Puncher