Though this isn't my belief per se, when my daughter was younger (3 at the time) , I had to take her to the bathroom. Well, after she went, I had to go as well (hell, I think my bladder is smaller than hers!). As I was squatting in the stall to go, she points directly at me and exclaims, in a raised voice, "Dad!! You have a *handle* on your BUTT!!!" ... this was at a Costco, which has no ceiling and rather decent acoustics.... all I could say was "Yes, yes I do" and exit the bathroom as quickly (of course washing both hers and my hands)
A childhood belief about rude bits

others believed things like this
- I used to think that when it rained,it meant God was washing his hands Anon
- I used to believe that every time I went to church, I got "points" to go to heaven. — Poxy
- When I was younger I used to think I was raised by Ewoks.— Travis
- My brother used to believe that ceiling fans were helicopters flipped upsidedown and stuck in the ceiling.— Seven
- when my daughter was much younger she used to beleive there was nothing but hair in her headAnon
- My niece believed that the longer I breastfed my baby the smaller my boobs would get. She was 4 at the time.— M