I was in chat today. And i accidentally pressed back, almost instantly i pressed forward again to stop myself getting logged out, it worked. About 20 mins later i went to do an action and noticed the options it brought up where like that of another users. I then tested it and found out I could PM myself along with inviting myself to different channels.
Here is a screenie.

If you want you can view the full image here
http://img171.imageshack.us/img171/2681 ... myself.png" onclick="window.open(this.href);return false;