Well it wasn't technically the final episode due to animation issues forcing the station to air it out of order, but I'm going to say it's the episode of King of the Hill that was intended to be the series finale. The entire episode is about Hank and Bobby finally finding a true common interest after years of "that boy ain't right" which brings their awkward father son character arcs to a close. In the final scene Hank buys Bobby his own propane grill and the two of them stand side by side grilling. As the smell of grilled meat wafts across the neighborhood and we see several other characters also get closure to their respective story arcs. Connie wants to go eat but knows that her parents, for the entire series, expect her to finish her homework first, but her father acknowledges that she is already ahead in her studies so it's okay for her to relax and enjoy the afternoon. We see Nancy, who had a long time extramarital affair under the guise of needing headache treatment, getting a temple massage from her husband Dale as acknowledgment that it's her husband who should be helping her with "headaches" instead of someone else. We also get to see Boomhauer's actual job which was never mentioned in the show. Then the scene cuts back to Hank and Bobby pulling the meat off the grill and in a nod to this being the finale Bobby looks at the one remaining steak and says "It looks like this is the last one". Hank replies "Your just getting started" to imply that even though this is the finale episode it's not really an ending because the characters do have a potential future. Then in a call back to the very first episode of Hank and his friends sharing a "Yep" the scene ends with Hank and Bobby sharing a "Yep".