Hank Hill is one of the main characters from the animated series King of the Hill, which was co-created by former Simpsons writer Greg Daniels. In King of the Hill he is voiced by Mike Judge and proudly sells "propane and propane accessories" as the assistant manager at Strickland Propane. He is known for having a narrow urethra and small buttocks.
In The Simpsons, Hank briefly appeared in the episode "Bart Star". In the episode, Bart's football team plays a team from Arlen, Hill's hometown. After Arlen loses the game, the camera cuts to Hank, who says "We drove 2000 miles for this?" Several other King of the Hill characters can be seen, including Peggy, Bobby, Luanne, Dale, Bill and Boomhauer.
- In "Thirty Minutes Over Tokyo", Barney imitates Homer in order to put drinks on his tab at Moe's, saying "D'oh!, woohoo!, uh... that boy ain't right.", combining Homer's and Hill's catchphrases.
- In "Helter Shelter", in which the Simpson house undergoes fumigation, the family questions one another on where to live. Homer decides to stand outside the house and wait. He opens a beer, and the King of the Hill theme tune plays. As with the theme of King of the Hill, time speeds up and events occur rapidly while Homer takes sips of beer, just as Hank does. Upon finding that only a few minutes have passed, Homer gives up.
- In "Missionary: Impossible", Hank can be seen at the end of the episode working the PBS-style pledge phonelines for the FOX network.
- In "Marge vs. Singles, Seniors, Childless Couples and Teens and Gays", while Bart and Lisa are fighting over the remote control, it stops on one channel and although the viewer cannot see the screen, they hear an imitation of Hank's voice saying "Bobby, I've got propane in my urethra," combining three recurring elements of the show.