I used to think that every time I would hold my breath brain cells in my head would burst. The image I had was of a boiling mass of tomato sauce with all these bubbles on top going *pop* *pop*.
I refused to swim, because that meant my cells in my brain would be popping when I went under.
A childhood belief about general

others believed things like this
- My brother used to tell me if I picked my nose I would become more stupid because bogey were brain cellsAnon
- my sister when she was little thorght head lice tried to borrow into her head to get to her brainAnon
- My mum used to tell me that baked beans were just peas covered in tomato sauce.— munky
- If you hold your breath and make a wish under a highway tunnel it will come true....I still hold my breath :)— aj
- I used to believe that your brain was a red rubber ball inside your head.— Greg
- I used to dream that if I held my breath, I could swim through the air for brief amounts of time— Adam