Wordpress and other weirdnesses

I had a case today in which Akismet let through several copies of the same spam, and blocked several other copies of the same spam on the same blog.

My guess (and I should have confirmed this by looking carefully at any available timestamps) is that it takes time to recognize a particular spam that's being sent out arouind the world, and I had the misfortune to be one of the "early adopters".

EDIT:  Nope.  Occasional copies of the same spam continue to get through, on the same blog and others.  Weird …