On one of my sites running WordPress, Akismet (and other antispam plugins) is not installed. In some ways, it has served as a honeypot, revealing interesting tidbits about how spambots work.
Fascinatingly, there were several hundred of these comments, all identical to each other. They look like templates for comments to be generated by spam-producing software, except that the software never processed the templates and posted them verbatim instead: