I just got three almost-identical spams from some outfit called fightnottobesingle.com, and at the bottom of each, I found this:

Dont Look Below:

bade a pit, as she had given directions, and poured in his offering--the blood
of holland. all this must have been prior to the death of the

two other of his unfortunate prisoners, then milked his goats as he was bade a
pit, as she had given directions, and poured in his offering--the blood

little hut on the edge of a big forest. now one night, when he two other of his
unfortunate prisoners, then milked his goats as he was bade

of holland. all this must have been prior to the death of the little hut on the
edge of a big forest. now one night, when he 'oh! no, no!' cried the sexton.
'i will give you a whole

and this:

Dont Look Below:

children ran they heard the sound of the broom sweeping the farmer, knowing that
the man was very slow-witted, gave him most back, and we will fly far away from
the ugly mole and his dark

him engage the right wing. children ran they heard the sound of the broom
sweeping the farmer, knowing that the man was very slow-witted, gave him most

all three were dressed in a curious manner. they wore short jackets him engage
the right wing. children ran they heard the sound of the broom sweeping

back, and we will fly far away from the ugly mole and his dark all three were
dressed in a curious manner. they wore short jackets immediately exchange this
university for a country life."

and this:

<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
notice of it, There can be no doubt, it seems to me, that this is
very like the war fever that occasionally runs through a civilised
ALCIBIADES: The same.
DICAEOPOLIS
of hospitality upon them, for that Jove was the avenger of wrongs done to
No, certainly not.
Ancient and modern philosophy throw a light upon one another: but they
Apollodorus, my friends here, bid me say thirty minae, and they will be the
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>

Huh?

ADDENDUM: No sooner did I post this than I clicked over to BoingBoing and stumbled across the answer. Seems spammers are using chunks of free e-text to get around Bayesian spam filtering. Hmph.