When I was younger I thought the Rudolphe the Red-Nosed Reindeer song said "you'll go down in his story" (as opposed to history) so I thought I could jump into the book and live at the North Pole. I was sorely disappointed when I learned otherwise.
A childhood belief about misheard lyrics

others believed things like this
- For the longest time I thought that Rudolph the Red-Nosed Reindeer had a very "chinese" nose...Anon
- I used to believe that the North Pole was the coldest place in the world and the South Pole was the hottest...— Logica
- I thought Santa was the President of the North Pole. It was stupid I know
lol— Lynn Wright - When I was 5 years old, I used to believe Poland was snowy and cold all year round, like the North Pole. — Sara
- i thought that we were just a big story book that ended when we died— samantha
- I didn't know Reindeer existed, I thought they were just christmas animals for storiesAnon