In a flashback to 1990, Bart goes to his first day of school, but things do not go so well for him and he becomes depressed. It is during discussions of Bart's future that the school psychologist realizes the young Lisa is very intelligent, telling Homer and Marge that they need to nurture her gifted spirit. They try to send Lisa to a private school but the tuition fee costs $6,000. Meanwhile, a terrible heatwave hits Springfield and Homer saves $200 to buy an air conditioner. Marge, however, asks Homer not to buy one until they figure out how to help Lisa. At the school, Bart talks with Milhouse and makes a farting sound, which Milhouse finds amusing. Encouraged, Bart entertains a group of children and sets out on his path to become the school prankster.