After seeing Homer's ability to absorb physical punishment, Moe suggests that he take up boxing and allow Moe — himself a former boxer — to manage and train him. Marge insists that Homer have a full medical checkup first. Dr. Hibbert discovers that the layer of fluid around Homer's brain is thicker than normal, allowing him to withstand powerful blows to the head. Discovering that Homer is too weak and out of shape to inflict any damage by punching, Moe suggests that he let his opponents exhaust themselves trying to knock him out, then push them down to the canvas for an easy win.