When I was younger I used to lie in bed and hear thudding sounds. I heard them every night when I was trying to sleep and was convinced king kong was outside lumbering about looking to eat me.
It was only when I was older, that I realised the thudding sound was actually my heart beating!
A childhood belief about monsters

others believed things like this
- When I was five or six, I was worried that I'd lost my heart because I didn't hear it beating.Anon
- For the longest time I used to believe that "Dracula" was a gigantic gorilla with fangs, not unlike King Kong.— Mark Cidade
- I still believe that if I really concentrate, I can stop my heart from beating.— Patrick
- I used to believe that you shouldn't swallow gum because it would stick to you heart and make it stop beating.Anon
- The song called heart of glass mixed me up as a kid. I heard "Heart and ass". — oops
- I used to believed that when I went to sleep my heart took a rest too, and didn't pump at all while I slept.— Lara