Given the Macbeth and Lear references in Lord Of The Rings, what about...
...this passage?
‘I remember that Boromir bore a horn,’ [Frodo] said at last.
‘You remember well, and as one who has in truth seen him,’ said Faramir. ‘Then maybe you can see it in your mind’s eye: a great horn of the wild ox of the East, bound with silver, and written with ancient characters.
So:
HAMLET My father, methinks I see my father.
HORATIO Where, my lord?
HAMLET In my mind's eye, Horatio.
I mean, both Faramir and Hamlet are here talking about dead people (brother and father: Boromir and Hamlet Sr.) and they are of course going through grief.