Of Course, It's Not All Gloom...

Duamuteffe: Hang on, let me trim your eyebrows. They're getting out of hand again.
Owlvark: But what about my other job as a Mentat? I'll get thrown out of the Mentat...League. Or whatever it's called.
Duamuteffe: How are you holding down a job as a Mentat? You don't even know the little saying!
Owlvark: The little saying?
Duamuteffe: You know, when Piter drinks out of the little bottle- "It is by will alone I set my mind in motion." You know, that bit.
Owlvark: Was that in the movie?
Duamuteffe: Of course it's in the movie! What kind of a Mentat are you, anyway?

(Note to lovers of the novels- yes, I am aware the saying was made up for the film. Do not bother to write and mention this.)