When I was a kid, there was a TV ad for pizza sauce and the jingle said, "Open yourself....some Pizza Quick Sauce. And open your own....pizzeria!". That was the first time that I'd heard the word "pizzeria", and thought that it must be some special type of diarrhea that you got from eating pizza.
A childhood belief about adverts

others believed things like this
- When I was Little, I thought a Pizza Pie was Tomatoe sauce, cheese, and Pepperoni inside of a pie crust....— LarLar
- I used to believe that if you ate the little seeds on pizza that pizza would grow out of your ears— chana
- I used to think that the word pizzazz was something to do with pizza.Anon
- When asked why he didn't finish eating the crust from his pizza, a young friend said "I don't eat the bone".— Dustin
- In the song "We're going to Ibiza", my friend thought they said "we're going to eat pizza"!— Smaranda
- when i was little i thought that pizza grew on trees and that the crust was poisoness thats why nobody ate it.— cameron