When my sister was about 6 or 7 (i was 15) i told her that if she kept picking her nose her brain would fall out. Well, she didn't believe me but a few days later i heard her screaming she ran to me with a bloddy nose and told me her brain was falling out!! she never picked her nose again :)
A childhood belief about picking my nose

you weren't the only one
44 of you believed this
- when i was little my mum used to tell me if i picked my nose too much my brain would fall out!!! think it did— Maz
- I used to believe that if you picked your nose then your head would cave in!— Sir Jared
- I heard a mother in the street tell her young son not to pick his nose...because his head would cave in. — Ruby
- my mum once told me if you picked your nose your brains came out!!!!— smiley : )
- My wife used to tell our kids that if you pick your nose your brains would fall out— grampy
- i used to belive that if i picked my nose my head would cave in— me