Dramatic irony
Dramatic irony is when you know something a character doesn’t, and you watch them carry on without it.
Normally you find things out at the same time as the characters. With dramatic irony you’re ahead of them, and the tension comes from that gap. Even ordinary lines take on a second meaning that only you can hear.
The classic example is the end of Romeo and Juliet. The audience knows Juliet is alive, and Romeo doesn’t. Horror uses the same trick (you’ve already seen what’s behind the door), and so does a lot of comedy, where the gap makes you cringe instead of worry.
It’s basically the reverse of a plot twist. A twist works because you don’t know something. Dramatic irony works because you do. Both depend on the author choosing exactly when you find things out, and that’s the real reason spoilers matter. A spoiler doesn’t just give away the ending. It can turn a book built on surprise into one built on dread, or take away the gap that made a scene so hard to watch.
Dramatic irony: common questions
What is an example of dramatic irony?
In Romeo and Juliet, the audience knows Juliet has taken a sleeping potion and isn’t really dead. Romeo thinks she is, and kills himself. The scene hurts because of what you know and he doesn’t.
What is the difference between dramatic irony and a plot twist?
With dramatic irony you know something the character doesn’t, which builds tension. With a plot twist the book keeps something from you, which creates surprise.