When the Sentinals catch up with him after the Ghost speaks to him, Ophelia describes a scene in which he behaves incoherently with her. The scene where he greets Rozencrantz and Guildenstern, in the lobby with Polonius and, later, with Ophelia; when h jumps into Ophelia's grave, and many others
He speaks to the ghost of his father, which she cannot see.
It illustrates Laertes close relationship to Ophelia.
"To be or not to be."
In Act 1 Scene 3 of Hamlet, Ophelia agrees to reject Hamlet's amorous advances as her father instructed her to do.
In Ophelia's mad scene she hands out flowers to various people in the Danish court.
In Act 3 scene 1 of Hamlet (the "nunnery" scene), Claudius and Polonius eavesdrop on the conversation between Hamlet and Ophelia. Well, it's sort of eavesdropping since Ophelia knows they are there and if Hamlet does not know at the beginning of the conversation, he figures it out pretty quickly.
The play's the thing wherein I'll catch the conscience of the king.
To Ophelia, during the 'Mousetrap' play scene, which is Act 3 scene 2.
In Act 4 Scene 1, the loony Ophelia sings a song about St. Valentine's Day.
In scene 5 lines 218-223, the nurse describes Paris as handsome, well-mannered, and a suitable match for Juliet. She speaks highly of his qualities and seems to support the idea of Juliet marrying him.
Most memorably, in Act 3, scene 3 when he comes across Claudius apparently at his prayers.