When I was little, pre pubescent, I used to believe that my testicles were a spare set of eyeballs. I used to believe that they would sometimes migrate at night and change places. That way, you could give your eyes a break and let the spare ones take over for a while.:-)
A childhood belief about rude bits

others believed things like this
- I used to believe that santa had a spare key to our house because we had no chimney.— Karl Andrade (Bombay, India)
- my dad used to tell me that if I ate in bed that ants would come out at night and eat my eyeballs!— jeps
- I used to believe that the cats eyes in the road...reflectors...were the eyeballs from real cats.— Liza P.
- my mum used to say if i lied my eyes would change colour...when i lied i would shut my eyes— kevin rosenqvist
- I used to believe that if someone had sex more then once a night they would break there penis and die— Chris
- I believed the sun and the moon were the same thing, just rotated to change from day to night.— Daniel