Mr. Krupt is the school�s new gym teacher and introduces Bart and the kids to �BOMBARDMENT!� Bart�s attempt to get back at the new gym teacher results in the destruction of Groundskeeper Willie�s shack and the family takes him in. Lisa decides to make Willie the focus of her science fair project and tries to turn him into a �proper gentleman� with surprising results. Meanwhile, Homer has ruined his last pair of blue pants and attempts to generate interest in them so the manufacturer will start making them again.