Presumably, the management eats, too, but nobody's ever seen them do it. No one's ever seen them pee, either. Ralph has a buddy he usually eats with. Ed works in another part of the Plant. Ralph doesn't know what Ed does, and Ed, of course, doesn't talk about it.
Nobody talks about their work.
They talk about baseball, TV, the weather, stuff like that. Ed often asks Ralph about his daughter, Sara. Ralph thinks Ed is a great kidder, too. Ralph once complained about how high his car payments were, and Ed jokingly offered to set fire to it, so Ralph could collect the insurance. Maybe that doesn't sound so funny to you, but Ralph thought it was a stitch.