ML/NJ
27L
Got to it before I could.
Airport runways are dsignated by their compass headings. DFW has two parallel runways that run north south and one runway that runs NW to SE. there is no runway 27!!!
Otherwise this is a very OLD joke. I learned it at Air Force Comm School 40 years ago when we were taught Air Traffic Control! We were told that it derived from a conversation that Wilbur and Orville had at Kill Devil Hills!