I'd play the single man or man in the abusive couple.
Plot would be something like my guy is walking past a married couple when he happens to catch the wife smiling at him as they pass each other in doorway, on sidewalk or aisle.
This happens again and again everytime a couple passes him over course of a few more days. One side of him thinks it's just human nature when eyes catch in a public place like doorway, sidewalk or aisle.
Then after another instance of the same thing happening, he decides to make a comment to the smiling woman and that leads to an unprovoked attack on him by her husband.
After a few days, he is able to invade the couples home and either abuse them by himself or with help of his own lady friend. Would like at some point for the husband to blame his wife for he entire ordeal because she smiled at the man in public.
Looking for at-least two other players to play the couple that will have home invaded after a public incident.