"She promises her students that if all of them have their homework on a given day, she will stand on her head or she will teach the class on her roller blades, or she will sing and dance for them. They actually do their homework, just to see if she will keep her word. And, by golly, she does. Somehow she wins them over early in the year with this stunt. She doesn't get 100 percent homework turned in for the rest of the year, but it really has made a difference."