Always up for lampooning pop culture in the 1990s, Duke Nukem set its sights on The Simpsons a few times throughout the seminal Duke Nukem 3D. During the Stadium level, you can see a blimp labeled "Duf Beer," likely misspelled to avoid any legal hassle. Springfield's Duff Beer blimp shows up a number of times throughout the series, including "Sideshow Bob's Last Gleaming," where the blundering criminal mastermind detonates a nuclear bomb within one, and "Lisa the Beauty Queen," where Barney crashes the zeppelin like the Hindenburg.
But Nukem isn't done with his winking asides. In The Birth level, you can find two more homages to The Simpsons. The words "pick up bart," referring to the episode "Brother From the Same Planet" which, in turn, spoofs The Shining, can be seen written backwards on a bathroom wall, just as Milhouse wrote it in the show. Homer's workplace Sector 7G can be found later in that same level, complete with his T-437 Safety Console, naturally littered with boxes of donuts and cups of coffee.