 Rebecca s estranged sister, Susan, is in Boston to shoot a commercial. She s an actress specializing in horror movies. She stops by the bar in the off chance that Rebecca might want to see her. Rebecca doesn t. Sam finds out that much of the sisterly discord is from the Susan stealing Rebecca s boyfriends when they were younger. Sam uses this information in his attempt to bed both sisters. He tells Susan that Rebecca and he are an item, after which she agrees to go out with him. He tells Rebecca that Susan is interested in him, to which Rebecca replies that to get back at Susan, Sam should break off their date and Rebecca would go out with him in Susan s place. So Sam postpones his date with Susan to take out Rebecca, with his date with Susan now later in the evening. However Susan can t wait and appears at the same time Sam is supposed to go out with Rebecca. For Rebecca, this is the last straw with Susan. Rebecca pulls out a gun and shoots Susan. Sam is mortified. But Rebecca isn t, nor is the rest of the gang at the bar, nor is Susan, who is still alive. Susan s acting talents came into good use as it was all a gag on Sam. Rebecca and Susan planned the whole shooting incident to get back at Sam for his come ons to both. In fact, Rebecca and Susan are grateful to Sam as this was the act needed to bring them back together as loving sisters.