And there assume some other horrible form,
Which might deprive your sovereignty of reason,
And draw you into madness? Think of it.

– William Shakespeare

Hamlet, Act 1, Scene 4. Horatio strongly advises Hamlet not to go with the Ghost. He expresses concern that the Ghost could change into some horrible beast and drive Hamlet to insanity. Horatio’s warning foreshadows Hamlet’s decision later to act out the part of a madman – “To put an antic disposition on.”