This show is pretty much the only animated show on that, when they had special guest stars, played it in such a subtle manner that you never know who they are until after the fact. The only ones to really play themselves like ZZ Top and Chuck Mangione are so weird it kinda gets a pass. My favorite ones are one I saw last night where Hank has to do yoga and Johnny Depp is the instructor, and the Boomhauer-centric one with Brad Pitt basically doing a hilarious take on his brother.