Originally Posted by
Macintosh
I think it's a scene that's sadly omitted from many productions, to the everlasting damnation of the director. That's Act IV, scene 4, where Hamlet, being escorted by R&G to England, comes across Fortinbras' army preparing to fight a battle over a rancid plot of land on which there wouldn't be room to bury the battle dead.
This is Hamlet's great soliloquy "How all occasions do inform against me..."
Why do I think this the climax? Because 1- We see clearly how Hamlet's different from the social mentality of the society around him, and that he's not beholden to the mores of the times, but is a truly "modern" protagonist. And 2- Finally Hamlet reverses this stance and swears blood revenge.
Right afterward, he sends R&G to their deaths, and upon his return to Elsinore, is a changed man, more distant, less introspective, more action oriented. And, of course, more cruel.