Bart is walking along one night and sees that his teacher Mrs. Krabappel has been stood up for a date at a nice restaurant. The next day in detention after school, Bart tries to console her. Mrs. Krabappel finds it very sweet and makes a move on her student. Bart asks her out, and she agrees. They wind up at the Sleep Eazy motel and they snuggle. Bart is on top of the world the next day. Fast forward one month. Mrs. Krabappel misses her period, she's pregnant. She breaks the news to her class and Ralph breaks it to the school.