I used to believe linemen ( said linnymen) was a road treatment that would cause damage to your car if you drove over it. It appears I was mistaken, and linemen are people...
Although, they will still cause damage to your car if you run over them, so I had it half right!
A childhood belief about speaking

others believed things like this
- I used to believe that if you drove over a banana peel the car would slide off the road.Anon
- I used to believe that cancer itself made you bald, rather than the chemotherapy treatment!— Maggie
- when i was younger i thought that areoplanes drove dead people to heavenAnon
- I used to believe that your belly button was what held your top half to your bottom half...— Debelouwho
- when i was little i used 2 believe that the moon was following us when we drove — whocares
- When I was little I used to believe that cars drove themselves.Anon