When I was a small child I lived in New Jersey, but travled two to three times a year to visit family in West Virginia.
Well if you know anything about regional words, you might know that some areas call soft drinks pop and others soda. New Jersey it's Soda, West Virginia it's Pop.
Until I was about five I believed that soda was brown (Coke, Pepsi, Dr. Pepper, Etc.) and pop was "colored" (Orange, Grape, Peach, etc). All because at home I was given dark pop's and while visiting family I was given light pop.
I've since overcome my confusion and now everything is pop.
A childhood belief about drinks

others believed things like this
- I thought there was a legal drinking age for soda (I had always been told that soda was not for children).— Dial Zero
- I thought that soda was also called "pop" because if you drink too much of it, you'd explodeAnon
- I used to beleive that a straw would float in soda because a little invisible elf would hold it up.— Mike
- Up until I was about seven, I thought soda pop was alcoholic and that's why kids weren't allowed it.Anon
- I use to think that alka seltzer tablets were instant 7UP soda until one day I tested my belief. — aj
- I used to belive that if you drank soda pop and ate pop rocks at the same time, your head would blow up. — erin