I used to believe - when I was a child - that when advertisements on frozen foods instructed the consumers that they can find said product in their "grocer's freezer," they were saying their "grossest freezer." I wondered for years why anyone would want frozen food from a gross freezer. :-)
A childhood belief about adverts

others believed things like this
- I used to believe that if I got a pet penguin it could live in the freezer.— Dippingmytoes
- That if you wet a sweet wrap and put it in the freezer overnight, you'd get chewing gum.— Roxie van Renbsurg
- i used to think a small man named homer lived in my grandmother's freezer and made ice. — ana
- My dad he used to tell me that mannequins were actually people who had been frozen.— Alecia
I used to believe that the Lord's Prayer instructed us to lead a snot into temptation. — Susan- As a child I always wondered why I could see everyone else's face and not mine.— Amit