Because you all seem to have a morbid fascination with panels that go wrong, here’s the impromptu filk from the Cultural Memory panel.
Update: Here’s David Anthony Durham’s version of events. Highlight:
As the guitar comes out Patrick bolts for the door, muttering curses. The woman… sings a song about… oh, I don’t know. Who could listen? At this point I’m just watching the exodus of audience members, wishing I was one of them.
Then the audience got in on the act and things went downhill from there.