The Vampire Is Still Alive (1989, Godfrey Ho)
Ostensibly a "sequel" to Robo Vampire
When two movie sorts accidentally disturb a Taoist ritual, their weekend doesn't go to plan.
In the Hoverse, time and space swap places, logic flies out the window and language ceases to have meaning. Or something.
Features a sequence that puts it up there with Xtro, It's Alive! and Men
Ahem.