“Happy Birthday” (*1/2 out of four) was an unhappy slog through horror-movie cliches about a young woman (Kim Sandwich) who is taken on her birthday by friends (Maddie Henderson, Tim Michael Schmidt, and others) to (yawn) a haunted house in which there is a demented killer running around. Or is this a figment of her imagination? Or one of her friends attempting to get back at her? Desperate collection of generic plot points and horror homages to much better movies (“Halloween”, “Friday The 13th”, just to name a few). Film doesn’t so much end as stop, if you make it that far.