This quote from Oscar, Tony, and probably Heisman Trophy winner, Mike Nichols:
Every scene is either a fight, seduction, or negotiation. Now you could say he’s stretching it, and you could argue that at times seductions are negotiations, but the real point here is that every effective scene needs some dynamic.
Two baseball fans in the stands just talking about the weather isn’t interesting. Umpires trying to decide whether the rain is coming down hard enough to stop a World Series game is.
A couple agreeing on what color to paint the house is boring. A couple throwing paint at each other is not.
Your scene needs some conflict, or one of the characters has a specific goal. There’s a dramatic reason for the scene.
It may be subtle. People are always looking for that little edge, couples are consciously or subconsciously trying to be in the power position in their relationship. Although a union contract might not be the topic on the table, this is still negotiation. Trying to get someone to agree with you is a form of seduction. The truth is in our daily lives we use most of these conventions all the time in our interactions; we just don’t recognize it. But for writers, they're the fuel that makes the engine go.
Rule of thumb: if you can just lift a scene out of a screenplay or TV show, or whatever without anyone missing it then it didn’t belong in the first place. We’re in a golden age of TV drama. Watch the good shows. See how every scene, every moment has a purpose, and is integral to the narrative.
A fight, seduction, or negotiation may be a little simplistic. But it gives you a good starting point. If you’ve written a scene that is just flat you can check it against those three dynamics. If it has none, or one but very mild, suddenly it’s no longer a mystery why your scene doesn’t work. Pick one or two or strengthen one or two.
Use Nichols’ quote as a guide. It may not be perfect, but it’s much more eloquent than mine.
A scene has to have… stuff.And that’s why he is who he is and I am who I am.