For example, in one episode Kramer was having problems with his swimming pool because they have aquasizing diving classes. So he starts swimming in the East River even though it's highly polluted. But the idea eventually catched on when he mentioned to Elaine's boyfriend, who has a bad back that swimming in the river was great for the back and him. Others in Elaine started swimming in the river as well. FYI, there were other two other signs of autism