The mockumentary POPSTAR: NEVER STOP NEVER STOPPING sometimes feels hilariously original and otherwise feels like a modern remake of This Is Spinal Tap … but that’s one of my all-time favorite movies, so I’m more than OK with both modes. Andy Samberg, as always, excels at playing a lovably dumb person in extraordinary circumstances — in this case, as one of the most famous musicians in the mid-2010s — and the parodies of pop songs he and the other members of The Lonely Island perform are really strong and REALLY silly. Also very enjoyable: The parade of celebrity cameos, some of which happen so quickly that “blink and you’ll miss them” may be an understatement; if you’ve never seen this movie, I’d recommend not looking at the cast list in advance.