When I was about 8 years old, around 1983 or so when the Smurfs were all the rage, I actually believed Smurfs were real. I even tried to look up the word "smurf" in the dictionary, but to no avail. Oh well. I got over it, though. :)
A childhood belief about toys

others believed things like this
- I used to believe that smurfs were real. I never ate mushrooms. I still don't eat them.Anon
- i used to believe that the smurfs lived in ordinary mushrooms and i would never eat them!!!— eimear
- my bro used to belive there were smurfs in the atms passing out money— L
- When I was a child I used to believe that smurfs lived in the mushrooms. So I didn't use to eat.— Ezgi
- I thought that 1983 went on for 3 years - had to ask my sister who decided how long a year lasted.— Sally
- I fully believed, up until about 6 years old, that the word 'accident' was a noun that meant 'burnt toast'.— Karl Goetz