When an attempt to make a telephone call was met with a busy signal -- when the "line was busy" -- I believed that the telephone operating Lion who was in charge of connecting the calls was otherwise engaged.
A childhood belief about telephones

others believed things like this
- I always wanted to use the telephone to call Jesus, Santa and Superman— Alex Burghart
- I used to believe that you could pass things down the telephone.Anon
- I used to think that everyone had a little person just like them that all lived in the telephone.— Jenni
- I used to believe that telephone poles grew out of the ground.— Jennifer (the blonde)
- I used to believe a mile was the distance between telephone poles.— Allegra
- I used to believe that bird perched on telephone wires to keep their feet warmAnon