1 Julius: Ave, Marce. Seen Lucium today?
1 Marcus: I saw Lucii's chariot in the foro. He's off to see Luciam.
2 Julius: You mean Lucius is going to meet Luciae at a gathering of the Luciorum?
2 Marcus: Until Lucia leaves Lucio, yes.
3 {silent beat}
4 Julius: I'm not going on with this. The grammar's too complicated.
4 Marcus: Oh, so you're declining to continue?

I admit I don't know enough Latin grammar to have written this myself. This was supplied by a reader.

Now that I've neatly deflected any blame for my typos, I'll just add that in inflected languages, Latin among them, nouns decline into different forms, depending on the grammatical case they take in the sentence.

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A reader kindly pointed out that Julius can't decline to continue. Since "continue" is a verb, he'd have to conjugate it instead...

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2015-02-02 Rerun commentary: I had a girlfriend once who was studying Latin. I asked her to conjugate, but she declined.