Whenever my mom would take me to a fast food joint, I'd always want her to order me large, or extra large fries if they had them, because I believed I got longer fries if I got a larger size. I even complained once that 'these aren't large fries' because they were too short.
A childhood belief about general

others believed things like this
- I used to believe that french fries were made of bread.— tendersoul
- When you ordered small fries they were just shorterAnon
- I used to believe that ketchup was used to make fries colder so they would be easier to eat.— Amber
- I used to believe that french fries were filled with mashed potatoes.... wonder how they got in there?— Nancy
- I thought rice was just another way to prepare a potato, like mashed or fries.— Me
- I thought french fries were really invented in France (they are Belgian for those who don't know)— Quarm