I would not say such things if I were you!
6 seconds sound clip from the The Princess Bride (1987) movie soundboard.
You can hear this line at 01:05:48 in the Blu-ray version of the movie.
Quote context
[...]
- I would not say such things if I were you.
- Why not?
- I would not say such things if I were you!
- You truly love each other, and so you might have been truly happy.
- Not one couple in a century has that chance, no matter what the storybooks say.
- And so, I think no man in a century will suffer as greatly as you will.
[...]