"In Happy Death Day, Teresa "Tree" Gelbman's birthday is the worst day of her life, starting when she wakes up in a stranger's bed. It's also the last day of her life, ending when she's killed by a psychotic killer with a knife. She's dead. And then she wakes up in a stranger's bed, it's September 18, and she has to live it all over again. until she's hunted down and wakes up, again, and again. It's a Groundhog Day situation, only with murder, guns,...