The old commercials for Dow Bathroom Cleaner showed anthropomorphic animated bubbles emerging from the bottle and scrubbing a bathroom (the "Scrubbing Bubbles"). I believed that was literally what would happen if we bought the product, so I begged my mom to buy some. I was extremely disappointed.
A childhood belief about adverts

others believed things like this
- I used to believe that commercials would only go away when you bought the product that was being advertised.— Hayabusa
- I used to think that "elbow grease" was an actual product of kitchen or surface cleaner.— Carrie
- I used to think when you farted, bubbles came out.— Nick
- I used to believe that eyes where just like bubbles and if you where to touch them they would pop.— Adam
- I used to believe that if I swallowed gum I would bubbles when I 'trumped'.Anon
- If i farted in the tub the bubbles would be different shapes.Anon