I used to believe that fax (as in fax machine) stood for Furry Animal Xpress and that the squirrels carried your messages back and forth across the power lines.
A childhood belief about general

others believed things like this
- I have always lived very near to a power station, and I used to believe it was a cloud making machine.— Kirsty Martindale
- i used to believe that our ansering machine was the washing machine and that it could talk
— tamara - I used to think all furry animals were made entirely of fur.Anon
- when i was 4 i used to think that mushrooms were going to attack me with their furry stigers— Milan
- i used to believe that dogs were furry midget who walked on for legs— doggy
- I used to believe that chipmunks were baby squirrels Anon