This past Friday night at Sweetwater Music Hall in Mill Valley, CA, Primus bassist Les Claypool joined Dean Ween and his band on stage.

As Jambase reports, Mickey “Dean Ween” Melchiondo brought Claypool, who has been a longtime friend and supporter since the breakup of Melchiondo’s band Ween, to join the band for a run through of Ween’s “The Mollusk.” View the collaboration below, complete with an awkward handshake after the song.