Carla comes into the bar in a huff. Her ex-husband Nick is getting remarried to stereotypical dumb blonde Loretta, and Carla is invited to their wedding that evening. What Carla is upset about is that he is marrying "a dish", while he knows that there is no one special in her life; he is rubbing his happiness in her face. Diane suggests that she bring to the wedding someone who would make Nick jealous. Carla jumps to the conclusion that Sam would be the perfect person. Sam and Diane are scheduled to go away for the weekend, and thus he declines Carla's offer, that is until Nick and Loretta show up at the bar and do indeed rub Carla's nose in their "wedding bliss". Sam and Carla go through with the charade of being boyfriend/girlfriend through the wedding, and post-wedding at the bar, where Nick and Loretta show up. Their charade does the trick as witnessed by a resulting act by Nick. But at the end of the day, Carla may still feel that she got the short of the life stick.
—Huggo