My suggestion for a Daily Dialog theme:

One half of a telephone conversation.

Here's my example from the brilliant WITHNAIL AND I. A drunk and angry Withnail phones his agent from Penryth:

WITHNAIL:
Hello. How are you? Very well. What! Why wouldn't they see me? This is ridiculous. I haven't been up in a job for three months. Understudy Constantine!? I'm not going to understudy Constantine, why can't I play the part? This is ridiculous. No, I'm not in London, Penryth. Penryth! Well, what about TV? Listen, I pay you ten percent to do that. Well lick ten percent of the arses for me. Hello? Hello? Hello? Hello? How dare you! Fuck you.

martinb, that's a fun idea. We did a telephone theme pretty recently, but I like your spin on it: Only those conversations where we hear one character's lines. I'll definitely store that one to use in the next few months after we allow some time from the preceding telephone theme. Thanks!

Hey, thanks so much for putting that scene up. Maybe it's because I saw the movie when I was an impressionable high school senior, but I love it way out of proportion. It has a classic moral code, expressed earlier when Lancaster suggests bailing on the mission and trying to find the buried gold left over from the revolution. Marvin says no: "We gave our word."
Lancaster: "My work to Grant doesn't mean shit."
Marvin: "You gave your word to me."

It has a kind of honky-tonk sentimental philosophy ...

Ryan: What was American doing in the middle of a Mexican revolution anyway?
Lancaster: Maybe there's only one revolution, ever since the beginning -- the good guys versus the bad guys. Question is -- who are the good guys?"
It has crack-pot movie poetry in so many of it exquisitely corny lines (don't try this at home, kids!):
Bellamy: "Your hair was darker then."
Marvin: "My soul was lighter then."

Lancaster:"Thirty seconds after I light that fuse, dynamite -- not God -- will move that mountain into this pass. Peace, brother."

Marvin: "So what else is on your mind, besides hundred proof women, ninety proof whiskey and fourteen carat gold?"
Lancaster: "Amigo, you just wrote my epitaph."