How could he be your husband? How could you leave dad for him?...
Marty McFly: [referring to Biff] How could he be your husband? How could you leave dad for him?
Old Lorraine: Leave dad? Marty, are you feeling all right?
Marty McFly: NO! NO I'M NOT FEELING ALL RIGHT! I DON'T UNDERSTAND ONE THING THAT'S GOING ON AROUND HERE AND WHY NO ONE CAN GIVE ME A SIMPLE STRAIGHT ANSWER!
Old Lorraine: Oh... They must have hit you over the head hard this time.