Universal has released the first trailer for Ma. Octavia Spencer stars as a lonely woman who lives in a small Ohio town. When a group of teenagers ask her to buy them booze, she does them one better by letting them party in her basement. But this kind gesture eventually leads to obsession. This looks like another run-of-the-mill thriller in the vein of Single White Female. But it's nice to see Oscar-winner Spencer having a blast. Ma opens May 31.