Too bad. I thought they were Harkonnen.
4 seconds sound clip from the Dune (1984) movie soundboard.
You can hear this line at 02:24:13 in the Blu-ray version of the movie.
Quote context
[...]
- Fearing for his life, Rabban did his best to hide this fact from his uncle, the Baron.
- Paul's sister, Alia, matured at a frightening rate.
- Her small body harbored tremendous powers.
- We surprised a band of smugglers.
- Too bad. I thought they were Harkonnen.
- Gurney!
- You've no need of your weapons with me, Gurney Halleck.
- Don't you trust your own eyes?
- They said you were dead. They... They said...
[...]

 Dead of Night (1945)
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 Knight Rider (1982)