The Dungeonmaster is an adventure movie depicting a modern computer programmer that gets transferred to a fantasy lair run by ancient sorcerer who challenges him to tasks of defeating enemies in various modern and historical scenarios.
The Dungeonmaster is actually an anthology: Each one of the seven segments is written and directed by different people, and then tied together with interludes of the lair where the programmer returns victorious after each task. The movie would be totally banal if it didn’t have two distinctive modern 80s segments in it; one involving a serial killer and another, hilariously over the top scenario featuring W.A.S.P.
The movie remains the best known for the wide public as the origin of the like ’I reject your reality and substitute my own’, as quoted by Adam Savage in one of the episodes of the MythBusters. The movie is not worth your time for the quote alone, but you might still find it interesting fast forwarding to check it out, as well as watching through the two aforementioned segments.