Remember when About a Boy's Will (David Walton) showed up on Parenthood [1] months ago? Crosby (Dax Shepard) is repaying the favor by coming over for a wild poker night! Both shows are produced by Jason Katims, and since they both take place in the San Francisco Bay Area, producers thought it would be fitting [2] if the two musicians knew each other. Even though we knew this was coming, it's still kind of bizarre to see the worlds meshing. The full episode airs tonight at 9 p.m. on NBC!