The trailer for the new film Y2K gives viewers a pretty good idea of the structure of the film it’s promoting: what begins as a high school comedy abruptly shifts gears into horror — a mash-up of American Pie and Maximum Overdrive, maybe. When I went to the Alamo Drafthouse on Tuesday to watch it, I thought about another point of comparison during much of the film: Attack the Block, another movie that effectively blends comedy, horror, and science fiction. But it wasn’t until Y2K’s climax that I realized that the best point of comparison wasn’t any of these films. Instead, it was Austin Powers: International Man of Mystery.