h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

This sentence is self referential.
This sentence wants to be self referential but doesn't know how (though it succeeds in spite of itself).
This sentence disagrees with the first sentence without knowing exactly why.
This sentence attempts to undermine the confidence of the third sentence but fails miserably and retires in confusion.
This sentence is the last sentence in this dialogue and is self-referential as well.
This sentence has (as its sole raison d'etre) the task of refuting the previous sentence's remarkably silly and pretentious claim to being the last sentence when, clearly, THIS is the last sentence in this tedious and quite pointless dialogue.
This, the actual last sentence in this dialogue taunts and ridicules all the sentences that thought they were last but were not, while simultaneously deriding the previous sentence for its pretentious use of raison d'etre and assures its place in the dialogue by killing the final sentence which attempts to follow.
This sentence UUURRK