When I was a kid I remember seeing some kind of PSA (which I'm now sure I must have completely misunderstood, given how my interpretation makes no sense) that said something like "if a kid doesn't know what he wants to do for a job by the time he's 14, he's screwed" (not in those exact words, obviously). As I was 12 or 13 at the time and had no idea what I wanted to do for a living, I was rather scared.
A childhood belief about adverts

others believed things like this
- I thought a major general is more powerful than just a general (which still kind of makes sense to me)— Demond
- I thought the lines in the sky left behind by airplanes were "sky scrapers". Makes sense.Anon
- I used to believe that, in a deep and profound kind of way, the words "door knob" rhymed with "said so". — Katie
- when i was little i asked what time midnight mass started.
i honestly had no idea.— what time?? - I believed that linguini was made of tape worms and was scared to eat pasta for a long time!— Mojo!
- Mom couldn't understand why at dinner time I wanted Chicken Pox.— Kristin