A violent, strange and oddly spiteful Christmas horror film, Don’t Open Till Christmas follows a serial killer who spends his nights prowling London and hacking up men and women dressed as Santa Claus. Here we have a film that exists solely to offend: cheap, low rent, bottom-shelf sleaze with no regard for its characters, its audience or its story. But, hey — you’ve got to respect a movie that derives so much joy out of punching Santa in the face until his eyeballs fall out.