I hate to admit this.. but as a kid (13-15) we would call randon numbers from the phone book and tell them that because they were such good customers, they had received an additional 6 feet of phone line, and all they had to do was pull on the line and it would come out of the wall..... we WAITED FOR THE “ click” AND WE KNEW WE WERE SUCCESSFULL
I'm sure that for teenagers, it was fun to imagine that, but most likely it just meant that the person on the other end hung up the phone.
:-)