Infinite Jest: Keep Coming Back! Part 1.

Read this scene from Hamlet, Act 5 scene 2, and note how many times the word "head" is mentioned along with the way Hamlet plays with time.

HORATIO
If your mind dislike any thing, obey it: I will
forestall their repair hither, and say you are not fit.

HAMLET
Not a whit, we defy augury: there's a special
providence in the fall of a sparrow. If it be now,
'tis not to come; if it be not to come, it will be
now; if it be not now, yet it will come. The
readiness is all. Since no man of aught he leaves knows
what is't to leave betimes, let be.

If only Orin Incandenza had read Hamlet, he might have known from where/when (or more specifically whence) his sparrow came.

And now later more:
I've realized I'm in a sort of conscious Denial about this quote third possible narrator unquote, if not denial then a resistance to the terrible narrative "under toad" it represents and the deep, deep sadness and despair it evokes in me. The question is how much more of my denial is unconscious and keeping me from reading as deeply as I'd like? So I'm reading bits of Hamlet to remind myself of the strength and determination of Hamlet's quest for revenge.