Every now and then I find trolls haunting my blogs. Some of them leave offensive comments and forget that their IP addresses make it clear who they are.
Sometimes they make the mistake of visiting from their offices or schools and I am able to return their favor by taking screenshots of their visits and sending those to the appropriate parties on the other end.
Most of the time that is not an issue, I just block the IP and they go away. There are better uses of their time.