Some passengers on Ralph's bus who have been offended by him have complained to the bus company, so Ralph's boss orders him to see the company psychiatrist. Ralph thinks that the boss thinks he's crazy, and that this is the end of his career as a bus driver. Ralph takes Norton with him to the psychiatrist's office and within minutes they're fighting. The doctor enters the room and finds Norton standing on a desk and Ralph threatening to beat him up. The doctor sends Norton out of the room and gives Ralph his diagnosis: Norton aggravates him, so he should avoid seeing him or risk a nervous breakdown. Ralph can't tell Norton face to face that their friendship's over, so he writes him a letter. Norton accidentally sees the letter and thinks it's a suicide note. He decides to stick to Ralph like glue, to prevent him from killing himself. After two days of Norton's tailing him, Ralph thinks he's going nuts. One second he looks,, and Norton's there; a second later he's gone. Ralph thinks he' (thetvdb.com)