When I was around 5 years old, I frequently heard my great-aunt say to my older sister, "Stop tying up the phone!" (as in talking on the phone too much)
That led me to believe that she was actually tying knots in the phone connection line.
A childhood belief about telephones

others believed things like this
- I always thought that my relatives were really tiny, and inside my phone when I talked to them on the phone.Anon
- i thougt robers could shoot into the phone and the bullet would come through and hit me— knowledge
- Yep I thought the Zephyr song was fly away on my cell phone— Jenny
- My parents said that gnomes tied knots in my hair while I was sleeping. I had insomnia for years.— Daria
- When I was in kindergarten, I thought the last line of "America" was "Great God our kid." — CC
- My oldest sister is 15 years my senior. I used to think that she was older than my mom.— Callie