Most good stories start with a fundamental list of ingredients: the initial situation, conflict, complication, climax, suspense, denouement, and conclusion. Great writers sometimes shake up the recipe and add some spice.
Exposition (Initial Situation)
Lovers' Quarrel
A man named Eddie has shown up at a motel room belonging to a woman named May, and May just doesn't seem to know how she feels about it. On the one hand, she apparently hates him. On the other hand, she clearly wants him to stay (hey, love is complicated). Apparently, they have quite a bit of lovey dovey history, and she has major abandonment issues—so that might explain the push-pull thing she's doing with him.
Rising Action (Conflict, Complication)
Three's A Crowd
While they're talking, it becomes clear that May is expecting someone else that evening. When she tells Eddie that, he totally flies off the handle and gets super angry. He storms off, and May is devastated. Then he returns pretty soon after. Apparently he had decided May was lying about this other dude. But then he storms out again pretty quickly, and May is, once again, devastated. Are you seeing a pattern here? Okay, good.
Anyway, after some more shenanigans and conversations in that same vein, suddenly headlights appear in the room from outside. May thinks it's her date, so she goes to the door. But it turns out to be some woman in her Mercedes Benz, who just stares at May. Eddie gets May away from the door quickly, and the woman in the Benz shoots out the windshield of Eddie's truck and drives off.
Well then. May is sure it's the "Countess," a woman Eddie had been cheating on her with.
Climax (Crisis, Turning Point)
Out In The Open
Another set of headlights soon appears, and this time it is May's date, Martin. May tries to pass Eddie off as her cousin (which was his suggestion), but Eddie rats her out for lying and then reveals the truth: that he and May are half-siblings. Cue a collective "eeeeew."
Falling Action
Worst. Date. Ever.
Now officially on the worst date in the history of the world, Martin sticks around to hear the dirty details (although at one point he does try to get out through the window—Eddie stops him). It seems that May and Eddie had shared a father, a bigamist who had split his time between the two families. Unfortunately, May and Eddie had already gotten busy before the bigamy/sibling thing was discovered.
Oh, and we probably should have mentioned that there's a character known as the Old Man sitting on a platform at the front of the stage who sometimes talks to Eddie and May, and it turns out that he is their father. (He's not literally there, of course—he's just in their minds.)
He's definitely pretty interested in hearing his kids' retelling of his big fat bigamist life… until he finds that he doesn't really like their version. In particular, he is very upset to hear that Eddie's mother had committed suicide after he peaced out on both families once the jig was up.
Eddie and May make googly eyes at each other as May tells her half of the story, and they eventually start making out. Rinse and repeat that collective "ewwwwww."
Resolution (Denouement)
Return of the Countess
The return of the Countess's headlights breaks up the incest love fest. She apparently shoots Eddie's gas tank, which means his car goes up in flames (and the horses in the back race out of their trailer). Eddie says he's going outside to check on the damage. May doesn't want him to go, but he says he'll be right back.
She then starts packing a suitcase. When Martin kind of asks what's up/tries to find out if she needs anything, she says she's sure Eddie is not coming back—he's flown the coop. So, she packs a suitcase and follows. Martin is left there dazed, and the Old Man is rambling on about Barbara Mandrell being his wife.
Because what that man needed was another wife.