For some reason I got it into my head as a child that when you went to the bathroom only you could hear yourself- kind of like chewing something very crunchy and it sounding much louder in your head.
You could imagine how shocked I was on vacation when through thin walls I heard my mother going number 1 & shouted "Hey! I can hear you pee!" Her response was "Well yes, can't you hear other people pee too?"
It still makes me uncomfortable when I hear or know others can hear me pee in public restrooms!
A childhood belief about weeing and pooing

others believed things like this
- I used to hear "Everytime you go away, you take a piece of Meat with you"
Makes a nice light snack I spose.— Linda - When i was about 5 years old, i used to believe that everything i thought people could hear!Anon
- I used to believe that no one could hear me when I hummed — Grace
- I used to belive that if I put my finges in my ears when i sang noone could hear me— Helen
- When I was younger, I used to believe if i covered my ears before I farted no one else would hear it.— Lime
- I used to believe that if you spoke into the speakers that they would hear it at the radio station. — natalie