When my room was a mess I thought my mum was saying "it looks like a bombsit" which always confused me. I was about 16 when I realised she was actually saying "it looks like a bomb's hit it".
My sister also thought that balloon was actually said 'bloon' and that crayon was 'crown'.
A childhood belief about speaking

others believed things like this
- My older brother used to tell me that if I "untied" it, I'd fly around the room like a balloon. — Gullible youth
- When I was little my sister told me that if I put a C.D. in the wrong case, it would mess up the C.D.'s songs.— Torrie
- My sister told me once that if I sucked too much helium out of a balloon, my lungs would explode.Anon
- As a child I was taught that the tooth fairy would buy our teeth so she could add them to her crown.— Lola
- I used to think that 'non toxic' was a color. I always did wander why is was written on every crayon.— Maddy
- I used to think there was a crayon called "window color." Turns out there isn't. — Not the brightest crayon in the box