Much of the cast and crew of the new indie horror-comedy Deadstream got their start as horror creatives working at haunted attractions. And their dedication to — not to mention talent for — creating a non-stop thrill ride designed to make audiences squeal (and giggle and jump and throw popcorn in the air) is evident in this absolute blast of a haunted-house movie. Deadstream makes smart use of the found-footage format, using it to tell the story of perhaps the world’s most annoying YouTuber (a competitive prize, but he deserves it), who attempts to make up for an unnamed transgression by livestreaming his night in a haunted house. This guy likes to complain about “cancel culture,” but the thing that’s coming to get him tonight is so much worse. With impressive practical effects, a grim sense of humor, and killer timing, Deadstream is best experienced with a crowd.