When I was young, I got in an accident and ended up with a CT scan. My dad told me that if I wasn't careful, he'd have to get my more brain fluid at the local drug store.
For years, I believed that brain fluid was available in a glass jar at the Walgreens down the street. We baffle other children all the time with that one now.
A childhood belief about general

others believed things like this
- When ever we went to the gas station, it was to replace the blinker fluid.Anon
- i was always told if i picked my nose my brain would fall out! i belived it for years!Anon
- for some time I used to think that at a drug store people really sold drugs.— NEO_ryu
- When I was little I believed that boogers were parts of my brain that got used up.Anon
- my mom told not to pick my nose because if i fell i would poke my brain.— brent
- My Gran told me that if I picked my nose, I´d get brain cancer. Traumatised? Yes I was!— Windy Girl