I used to believe that "some assembly required", as heard in countless television ads, meant that some of the boxes in the stores held completely assembled products and some required assembly. I could never figure out how I could never pick a box that contained an assembled toy. Never lucky enough I thought.
A childhood belief about adverts

others believed things like this
- I thought for some reason that chewing tobacco was REQUIRED for Major League Baseball players.— Jeff
- When very little I completely believed the mascot for Lucky Charms was the Almighty God.— Brendan
- I heard a mother in the street tell her young son not to pick his nose...because his head would cave in. — Ruby
- I thought that serial killers had serial numbers like products did so the cops could identify them easier. — C
- I used to believe that people who were lactose intolerant could not consume ANY dairy products AT ALL. — Marideth
- I used to believe that I could jump through the television and be where the people were on television.— Ash