I saw an amusing one the other day:
Despite it not making much sense, I recognized it for an old joke I know. The spammers are apparently taking existing, normal text, and running it through a thesaurus so that they don't end up posting the same spam text on multiple blogs and websites. Like that, they hope to evade the spam filters. But they do this programmatically, so that they can do this automatically. This leads to some rather silly substitutions. For example, the postal worker presumably said "You have" which was changed to "You possess." Heh.
A quick Google Internet Search yielded the following source text:
The one word match which seems strange is "letter" to "learning". I am not sure why their thesaurus suggested it. Perhaps because it has a stemmer and an automatic word form generator. Then, "lettered" would accord with "learning".