As Michael Bolger noted in the Comments, Mike Patton joined long-time collaborator Kid Koala and his latest project The Slew on stage at The Independent, San Francisco on 25 September. Amazingly, given his infamous immortalised on YouTube comments about the Australian band, The Slew also features Chris Ross and Myles Heskett, who until very recently were the rhythm section of Wolfmother.
Footage from the gig:

Patton on Wolfmother:

Photo Gallery from the show here.
More on The Slew here and here.