Thanks to a rather misleading reproduction diagram in a childrens fact book, I was, for a long time, under the impression that only boys had bladders.
A childhood belief about weeing and pooing

others believed things like this
- I used to believe that child line sold childrens toys— Gayle
- I never knew why boys had to lift up the toilet seat...until my friend told me that boys had bad aim.Anon
- I used to believe the Beastie Boys were a boy band. Well, the name sounds similar to Backstreet Boys!Anon
- After I saw the Wizard of Oz, I was under the impression Kansas was black and white.Anon
- As a child i was under the impression that the huge power station chimneys were cloud makers.— scruffyoik
- I thought the mole on my arm was from a bug pooping on my arm a long time agoAnon