My 4 yr old son believes that if he picks his nose his brains will come out.
To which he says to me "I got brains in my nose" (if it needs blowing) and if he manages to catch one on his finger its, "I got my brains" and shows me his finger.
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