I used to believe human mucus was healthy to ingest because it was gross, logically stemming from vegetables being gross, which I got from some tv shows.
A childhood belief about picking my nose

others believed things like this
- i used to think boogers were chewing gum. Gross, i know!— ediop
- That donuts where healthy!!!— Stephanie!!
- I used to be believe that vanilla ice cream was the "healthy" flavor.Anon
- We were told that the bread crust is more healthy than the centre.— Arnon
- I used to think that when I ate vegetables I will be smarter.— Dark_X_Raider
- I used to think sausages were vegetables, and they grew in the ground.— K.L.