here's a couple more.

among my favorites:

A man said to the universe:
"Sir, I exist!"
"However," replied the universe,
"The fact has not created in me
"A sense of obligation."

(Stephen Crane)

something i remember from eighth-grade english, though i have no idea who wrote it and google is turning up nothing:

Michelangelo
saw Moses
in a block of marble.

So my O.E.D.
should hold another Hamlet
or another Lear.

Wait.
Was that a block of marble
or his block of marble?

and, there's something i've been trying to find again for ages -- it was posted on a bulletin board as part of an exhibit of some kind when i was in high school, and i wrote it down (thank goodness; i know it's somewhere, somewhere, in my parents' house), but again, i have no idea who wrote it, and i can only remember bits here and there.  it's about being adrift -- now i am splashing about in boiling bitter coffee; steam rises ... i think there's some more here, but i can't remember it i am burning my fingers and toes.  i am dizzy.  it's mostly that, but the bit i always remember is voices tell me i must learn to take my coffee black and pungent.  but i know as they speak they bathe in rippling pools of cream ...

a thought, in the midst of preparing a conference paper

ooh.  maybe nobody will come.  if nobody comes, do i still have to present?