So a few times now we've noticed this happening:

 Oct 30 18:25:10 --> eddie36 (~Eddie@216-239-45-4.google.com) has joined #botfu
 Oct 30 18:26:59 -(pippin)- eddie36 why are you here?
 Oct 30 18:27:11 <-- eddie36 (~Eddie@216-239-45-4.google.com) has left #botfu (eddie36)

As you can see, it joins, doesn't respond to anything, and leaves a minute later. I've e-mailed the nice folks at Google. Not because I don't like what's happening, but because everyone who's seen this (not to forget their dogs) seems to be wondering what the hell it's doing it for. I know I do.

Naturally, other people have posted this as well. Here's one.

I'll be sure to post the answer.