Do you think the following sentence is grammatically correct?
And it sounds fine?

Emperor Part From Empress
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Comments  (Page 2) 
Hello again Jobb

A 'placard' consists of a large piece of cardboard attached to a stick. There is usually a message written on the cardboard in capital letters.

In this instance, the placard would say EMPEROR PART FROM EMPRESS. 'Part from' is an imperative, meaning 'separate yourself from'. As with headlines, it's permissible to leave out 'the' and 'a' when writing placards.

So the message would mean 'Emperor, you should begin divorce proceedings'.

I admit it's a fairly unlikely scenario.

Yes, you found another possible interpretation!
In the case of headlines it is often possible to find many readings, especially if you're willing to consider extremely fanciful ones!

Emotion: smile
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Aside from the suggestion that PART functions as a verb and therefore requires an -s to agree in number with the subject EMPEROR or that PART is imperative in form and therefore doesn't require an -s to agree in number with the subject, but would then require punctuation (e.g. EMPEROR, PART FROM EMPRESS!), the only other interpretation seems to be that PART functions as a noun and EMPEROR functions as an adjective, say, for example,

EMPORER PART (e.g., a description of how an acting role was played) was delivered FROM the EMPRESS.


EMPEROR PART (e.g., the name of a component) FROM (e.g., developed by; donanted by) a company named EMPRESS.
Got it clearer now.