In Dune the Baron kills Dr. Yeuh, who betrayed Duke Leto's family:
Baron Harkonnen: I said I'd set her free. That you could join her. So, join her.
He then turns his attention to motionless Duke Leto:
Baron Harkonnen: What do you think is next?
Then the scene cuts to Paul and his mother finds Leto's ring during checking a bag.
Why did the Baron ask this question?