Mr. Burns almost drown while taking a bath after Smithers put a sponge on his head that weigh him down . Later , after realizing that no one will carry on his legacy when he die , Burns decide to try to find an heir that will inherit his vast fortune . He hold an audition and many of the boys in Springfield try out , including Nelson Muntz , Martin Prince , and Milhouse Van Houten . Bart and Lisa also try out and fail ; Lisa because she is a girl , and Bart because he read Homer 's badly @-@ worded proposal . Angry and humiliated after the audition end , only made worse by Burns kicking him in the butt with a mechanical boot , Bart pay him back by vandalizing his mansion . Mr. Burns approve of Bart 's malevolence and decide to accept him as his heir .