I used to be convinced that the drink Sprite was called "Spirit" and that everyone else besides me was mispronouncing it.
A childhood belief about drinks

others believed things like this
- I used to think an evil spirit type thing called Wango lived in my dog. I was terrified of that dog.— Franklin
- I thought that soda was also called "pop" because if you drink too much of it, you'd explodeAnon
- I used to think that if you mixed a diet drink with a regular drink, it would explode. Anon
- Until I was about four and a bit my father had me convinced that Friesian cows were called "big cats".— Chris
- When I first started learning to read I was convinced that vowels were called barnacles.— Andy Howell
- My mother's name was Anna. She was called "Annemor"(Duck mama). I was convinced I was a duckling.— Christine Norway