She doesn't marry Humperdinck. She marries Westley. I'm just sure of it. After all that Westley did for her, if she didn't marry him, it wouldn't be fair.
11 seconds sound clip from the The Princess Bride (1987) movie soundboard.
You can hear this line at 00:53:03 in the Blu-ray version of the movie.
Quote context
[...]
- The king died that very night.
- And before the following dawn, Buttercup and Humperdinck were married.
- And at noon, she met her subjects again, this time as their queen.
- My father's final words were...
- Hold it. Hold it. Grandpa. You read that wrong.
- Well, who says life is fair? Where is that written? Life isn't always fair.
- I'm telling you, you're messing up the story! Now, get it right!
- Do you want me to go on with this? All right, then. No more interruptions.
- At noon, she met her subjects again, this time as their queen.
- My father's final words were... (2)
[...]