The Nightrunners. The two books are sadly out-of-print in their wonderfully colorful Bantam Spectra "science fiction" editions (which I found in mint condition in a comic book store ages ago), but are back in print in a new collection that also includes a third volume, which is brand-new and I have not read.
A meteor unlike any ever seen (The comet smiled. Split down the middle to show us a mouthful of jagged saw-blade teeth) swoops down and then disappears over The Orbit, an enormous six-screen drive-in move theater specializing in horror and exploitation movies on Friday nights in a small East Texas town. In its wake it leaves The Orbit seemingly hanging in outer space, an island adrift in an utter blackness that fries anyone who tries to touch it into a vomitous goop. What follows is an outrageous horrorshow in which the movies that play over and over (Texas Chainsaw, Evil Dead, Night of the Living Dead, etc.) on the enormous screens cannot hold a candle to the horror the characters are now trapped in. It's a bit like Stephen King's "The Mist" except not quite as dreary but still as existentially, well, fucked. People start to get a little crazy - which, in a Lansdale novel, means a lot crazy.
Horrible cover from Carroll & Graf, 1997, but at least they brought it back in print awhile
Lansdale scores some easy points with his narrator's attempts to find meaning in a universe that would let something like this happen ("Give me something to blame this on. A random universe with no god, evil or otherwise, is just too much for me"), but hey, Jack is only 18 and two of his buddies have been struck by strange lightning and fused into the Popcorn King, an insane demi-god that promises salvation to those who'll worship him. But once Jack decides it's tentacled aliens shooting their own movie, his much more level-headed friend Bob tells him, "Always got to have something to believe in, don't you, Jack? Astrology, Christianity, now B-movie gods." Bob and Jack figure out a way to escape The Orbit, but end up crucified for their pains.
Picking up right at the end of the first book, The Drive In 2: Not Just One of them Sequels introduces dinosaurs on the loose, carnivorous film stock, and a young woman who, adept at martial arts (like Lansdale himself), survives The Orbit apocalypse but meets up with Popalong Cassidy, a monstrous dude that maybe could have stepped whole and breathing from Videodrome. Now the world seems to be on a soundstage existing for the pleasure of alien filmmakers. Really. Truly.
The Drive In and The Drive In 2 really are unique in the annals of horror fiction; a two-shot bizarro sci-fi/pulp horror/apocalyptic-comic paean to trash culture in a world that's probably forgotten what "double feature" even means.