2x8 - Maniac Mansion

Tina and her friend Val go out to see a movie. During the show, Val acts mad at Tina. Val feels that her boyfriend is falling all over Tina and that she is stuck up. Later, Tina accidentally eats one of Fred's experiments that makes her really ugly. Tina then locks herself in her bedroom and refuses to come out. After realizing her mistake, Val comes over and apologizes for what she said. Tina and her make up, and the effect wears off.