When the ghost of Hamlet's father makes its follow-up appearance in act 1, scene 4, Horatio and Marcellus make it clear they are terrified and think it unwise for Hamlet to follow it, even if it does look like his father. However, Hamlet also makes it clear that he is not afraid and feels he has nothing of importance to lose in speaking with it since the Ghost is not a material being:
Why, what should be the fear?
I do set my life at a pin's fee;
And for my soul, what can it do to that,
Being a thing immortal as itself?
When Horatio and Marcellus attempt to restrain Hamlet through physical force, he shouts that his "fate cries out," making it impossible for him not to see the matter with the Ghost through until the end. His intuition is telling him this is something important. As his dialogue immediately following the Ghost's materialization already pointed out, Hamlet is curious about what the Ghost is and what it has to say, especially since he has been so despondent in the wake of his father's...
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