A guy came to my door today selling fish. More specifically, a ratty old blue mini-pickup pulled up in front of my house, a truck with a chest freezer in the bed, and a guy got out and came bounding up my steps with the false cheer of a true door-to-door salesman. I was on a conference call at the time, and I tried to get rid of him by telling him I was on a call, that I work at home. “What time do you get off work?” he said. “I don’t buy things from people who come to…