When I was younger, I tried many times to dial the telephone number of my own house to see if I could hear myself talking. When my parents explained that I couldn't get an answer from the number because it was our own house, I tried taking the cordless phone outside and calling from the backyard, thinking that one of the other phones in the house would ring.
To this day, my father swears that when he was a boy (and phones were more primative) it was possible to call your own number and get a ring. I'm still not sure if I believe this.
A childhood belief about telephones

others believed things like this
- when i was little i believed that your social security number was the number you were born on the earth — christine
- I used to believe that when you moved house you swapped house with the person moving into your old house.Anon
- I used to believe there was a number "eleventeen". I could never quite work out where it went, though.— Matthew
- I used to think boys went "number two" with their pee pees. Anon
- I used to believe that twenty was the largest number in the universe.— Bernardo Fernandez
- I used to think that any number with a decimal point in it was HUGE.— sm