Sometimes the easiest way to explain a film plot to someone is by summing it up in one sentence. Though it’s technically not wrong, it’ll make sense once you see it.
Some movies are so widely known that just about everyone knows what the story is about, even if they haven’t seen it. For example, I haven’t seen any of the Star Wars movies but it’s such a successful franchise and so many people have explained the plot to me, I kind of know what it’s about. So even if you explain a film plot badly, I know what you’re talking about.
These memes perfectly explain how to explain a film plot badly.