This is a weird bug, and I have NO idea how to reproduce it.
In #html on DALnet I typed:
how do I remove the padding that gets placed around a <hr>?

In my status window I saw:
PRIVMSYªVtml Unknown command

Like I said, I have no idea how it happened, I can't reproduce it (and no, no scripts loaded), but I was wondering if anyone else ever experienced this?