When I was learning to count, I always left out 7. Then, when I finally got used to it being between 6 & 8, I started to leave out 17... I always believed that it couldn't be a proper number because it always had one more syllable than those around it.
A childhood belief about counting

others believed things like this
- when i was little i believed that your social security number was the number you were born on the earth — christine
- When I was little i thought that seconds were so fast that you couldn't count them.— Baby
- I thought that Count Dracula was the count from Sesame StreetAnon
- When I first started learning to read I was convinced that vowels were called barnacles.— Andy Howell
- I believed as a child that the proper name for windscreen wipers was "lig-logs".— Ray
- In first grade I believed that I was from Mexico because I could count to ten in Spanish.— Lara Roy