My local hardware store has one of these signs. I managed a different hardware store about a decade and a half ago, and I also made a very similar one. (Mine was nicer, and routered out of a scrap piece of plywood.)
You would be amazed at the number of times we'd get asked that question. Typically it involved a story along the lines of, "Well, my wife started putting up her end of the Christmas lights at one side of the house, and I started putting up my end at the other side of the house, and we met in the middle, and..."
I don't understand how people need help making a cable like that. AFAIK It's a length of 3 wires wrapped in insulation, and two plugs. It's a hell of a lot simpler than ethernet.
Some older things might genuinely need that kind of cable, like a leaf blower or something