I finally stopped ignoring the old phone lines in houses
I was working on a retrofit in a 1920s house in Pasadena, and the homeowner, Mr. Ellis, pointed to the old phone jack and said, 'That thing still has a dial tone, you know.' I checked it and he was right. I used it to run a communicator backup, and it saved the system when the internet went down for two days. What's the oldest wiring trick you've used on a job?