The Griffin Family History - S4.E27

When burglars break into the house, the Griffins take cover in the attic where they discover Peter has built a 'panic room'. They go in it, and Peter tells them about his history. They send Meg for food but the burglars catch her. The rest of the Griffins stay behind and Peter accidentally floods the room and they're going to drown. Luckily Joe gets them out and we find out Meg has been accused of sexual harassment by the burglars.