 On the day of a history test at school , Bart gets a stomachache after accidentally eating a jagged metal Krusty @-@ O with his breakfast cereal . Lisa is the only one who believes him , however , and Homer and Marge send him to school anyway . Bart struggles through the test , and after finally convincing Mrs. Krabappel that he is actually ill , she lets him go and see the nurse . Bart collapses on the medical room floor , and is taken to Springfield General Hospital where he undergoes surgery from Dr. Hibbert and Dr. Nick , as it emerges he has appendicitis . While visiting Bart in the hospital , Lisa meets her hero , <unk> Bleeding Gums Murphy , in a bed in another ward . 
