Watching the 'Mr Muscle' cleaning product-range ads convinced me that the products actually made Mr Muscle appear in your bathroom or kitchen and clean up the place for you.
A childhood belief about adverts

others believed things like this
- I used to think that "elbow grease" was an actual product of kitchen or surface cleaner.— Carrie
- As a child I believed that when a person was fired from their job, they were executed on a firing range. — damien
- Until I was 7, I used to think bananas were a dairy product.— Amplexor
- I used to believe that people who were lactose intolerant could not consume ANY dairy products AT ALL. — Marideth
- I used to believe that commercials would only go away when you bought the product that was being advertised.— Hayabusa
- I used to believe thato to adopt a child you had to collect points from supermarket products...— Linda