Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Q: Movie Title: Synecdoche, New York (2008)  Did director charlie Kaufman create this keyboard for the movie or does it really exist? It looks so different.

A: What type of keyboard is Caden Cotard using?
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Q: What is the significance of annoying phone ring in Once Upon a Time in America?   At the the beginning of the movie, the phone rang for 4 to 5 minutes continuously.

A: What is the significance of annoying phone ring?
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Q: In Source Code, I did not get the meaning of a conversation between Capt. and Christina in the train. It was between roughly 00:42:00-00:43:00  The conversation was as follows:  Capt- Okay. Christina? Um...I've been having these dreams lately. Really vivid.   And you've been in them. Christina- Really? Capt- What? Oh. No. Not like that. Not that I wouldn't. I...It's just...Um..   So what was it that he wanted to say, but could not complete and why Christina left him without listening to him completely. I could not get that part.

A:
What does the conversation mean?
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