Jim Woodring demonstrated his giant nib-pen in publuc for the first time Sunday. Lots of people present took videos, like this one from the Seattle P.I.
And here's a really long video and a report from The Comics Journal.
Jim Woodring - Nibbus Maximus from Gavin Lees on Vimeo.
The best videos (that I've seen--it seems like anyone there with a phone took one) are on Jim's Facebook page. (I'm not sure they are public--I hope so!)