I used to believe, until I was about 13, that a guys 'nuts' were like actual nuts (similar to walnuts or something)... hard brown brittle things that weren't really connected to the guys body, just hanging loose. It made perfect sense to me, because I figured that the reason guys went into so much pain if you hit them 'there', is because the nuts could 'crack open'.
Even seeing biology textbooks at secondary school didn't change my view, because they just showed the balls as pale brown round circles in cross-section diagrams!
Even now, in the back of my mind, I still think of guys having brittle walnut-like things...
A childhood belief about rude bits

others believed things like this
- i use to believe guys could have a random # of balls but the maximum was 4— bookie
- I used to think tree-nuts (especially almonds) were made of wood. — Josh
- When I was younger I believed that pistachio nuts were made out of beetles that had somehow been dried out. — Alyssa
- I used to think that guys had periods, too. — Laurie
- i used 2 beleive i wuz an alien that had to save the world from "bad guys"— me not u
- When my brother would go by condoms i thought that guys had period and that is what they usedAnon