The Haunting, the original black and white version. Extremely effective and creepifying film, precisely because absolutely nothing is actually shown except shadows and awful noises. The unknown is usually the scariest thing, something far too many modern films have completely forgotten.

Also watched Song of the Thin Man, which is the sixth and last of the great series of detective films with William Powell and Myrna Loy. Offhand, I can't think of a more interesting onscreen couple than those two--fantastic banter and wit throughout them all, and clever mysteries along with it.

When people talk about how getting characters together 'ruins the tension' or some such nonsense, I point to the Thin Man films as evidence that a solid relationship need not be boring. It's really a failure of imagination to think that the process of becoming attracted to someone has to be dramatically superior to anything that could ever happen after that. A lot of tv shows could stand to learn that lesson, I think.