Humor and art: Both are better, more themselves, if they can't be readily explained. That's where Playboys & Killjoys comes in. It's the group show that kicks off the fall season at Ambach & Rice gallery, and its list of artists is part internationally famous (Erwin Wurm, Raymond Pettibon) and part up-and-coming (Eric Yahnker, Markus Vater, Sara Greenberger Rafferty). Themes include tiny pickles, the Bee Gees in the Bible, meals with dictators, the tragic figure of the standup comedian, mistranslations, and politics. There will be laughing with, and there will be laughing at. (Ambach & Rice, 5107 Ballard Ave NW, 789-6242, noon–6 pm, free)