Hamlet's Father Dies, this image is from Act 1, Scene 1
"What are you, that you walk out so late at night, looking like the dead king of Denmark when he dressed for battle? By God, I order you to speak!" -Horatio
Claudius Rises to Power Act 1, Scene 2
"Hamlet you're so sweet to mourn your father like this. But you have to remember, your father lost his father, who lost his father who lost his father before him..." "...each son had to mourn his father for a certain period. But overdoing it is just stubborn. It's not manly." -Claudius
Hamlet Goes Through an Emotional Outbreak Act 1, Scene 2
Ah, I wish my dirty flesh could melt away into a vapor, or that God had not made a law against suicide. OH, God, God! How tired, stale, and poitless life is to me..." "...My fathers not only been dead for two months--no, not even two. Such an excellent king, as superior to my uncle as a god is to a beast, and so loving to my mother.." -Hamlet
This is the opening of the story when Horatio and Bernardo are first discovering the ghost. This kind of kicks off the plot and it's a key element in the play because it results in the change Hamlet goes through, Claudius rising to power and the truth about Gertrude coming out in result of Hamlet's fathers death.
This was a moment that showed the readers what kind of person Claudius is and sets the attitude of his character for the rest of the play. This is kind of how he really introduces himself.
This was Hamlet during his soliloquay, this was a huge event in the play. It portrayed Hamlets position on his feelings toward his father and Claudius and his mother. This was the turning point from when he changed from normal to crazy. He feels like he wants to die.