THE GUEST Sara Gilbert
THE CHARACTER Laura Powers (from ''New Kid on the Block,'' 1992)
Any girl who can get Bart this upset (see Meryl Streep's Jessica Lovejoy later) is worth revisiting: Poor Bart had such a crush on Laura, his new neighbor's daughter, that he dreamt she literally ripped his heart out. Bart's deviousness won in the end, though, and they shared a romantic prank call to Moe in which Laura asked for ''Ms. Tinkle. First name, Ivana.''
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