Donna's Panties - S3.E15

Eric pulls Donna's pants down in public and reveals her granny panties to everyone. So he tries to make up by giving her sexy panties on Valentine's Day. When Kelso finds out that Laurie cheated on him he realizes how Jackie must have felt when he cheated on her with Laurie; to Jackie's surprise he doesn't want her to feel sorry for him. Fez asks Caroline to go steady with him and only afterwards does he finds out that she has some strange ideas about romance.