The following spam comment was blocked by my filter today:
I’m currently being held prisoner by the Russian mafia and being forced to post spam comments on blogs and forum! If you don’t approve this they will kill me. They’re coming back now. Please send help!
I’ve actually seen some “topical” spam (on Afghanistan), where an argument is made on an issue in the hopes that people will see the argument and assume the spam was an actual answer to a post.
They try, how they try.
Da Techguy's (no longer backup) Blog 
I’m currently being held prisoner by the Obama Administration and being forced to post spam comments on blogs and forum! If you don’t approve this they will raise my taxes, squander my children’s future on pork for their cronies, destroy my healthcare system, use my tax money to fund abortions, and endanger my life with inept foreign policy. They’re coming back now. Please send help!
it’s actually been interesting to see the evolution of spam over the last decade.