Ethernet Rules

I had a customer the other day that needed a piece of lumber cut. When I asked him the length to which the board should be cut he reached into his pocket and pulled out an Ethernet cable.

"I need it to be cut this long," he said showing me the mark he had made on the cable.

 "36 1/4 inches," I said after measuring his cable with my tape measure.

"Let me guess," I asked, "You must be a software guy?"