There’s all sorts of ways to spot spam (and fortunately these days Akismet just does it for us with a pretty good level of accuracy.)
I’m a fan of the tortured, mad-libbed language a lot of spam bots use. Whether it’s cramming the full title of a post into their comment (I guess it works for post titles like “Chocolate cake”?) or the random philosophical musing stapled to the end of a list of porn links … such things afford whole halfminutes of amuisement before I nuke them.
But really, nothing screams “I am not genuine” like this gem that popped into my spam folder today:
That is very fascinating, You’re an overly professional blogger.
Thanks, Genital Warts In Penis! You have made my day.