Simpsons Season 4, Episode 4: Lisa the Beauty Queen

Lisa's self-esteem breaks after she sees a crude drawing of herself at Springfield Elementary's fair. When Homer wins the Duff Beer raffle and a ticket to ride on the Duff Blimp, he sacrifices the ticket for the money in order to get Lisa entered into a beauty pageant. Although originally reluctant to enter, she competes and finishes second. However, after the winner is hospitalized, Lisa is declared the new Little Miss Springfield.