Here's the opposite - the book or film where you're left going 'What happened? Did they abc or xyz?' You flick back through the pages to try to work it out, but it doesn't seem clear. Two examples immediately came to my mind - Love Act by ME Austen, which ends just before the main character makes a crucial decision and The Great Indoors by Sabine Durrant, where I couldn't decide what had actually happened. (They're both quite old, so if you can think of some more recent examples, please let me know.)
Now, I know some people like the unresolved ending but I'm not a fan. That doesn't mean I want every single loose end tied up, but there needs to be a clear indication of where we're going. After I'd sold my first novel, Adultery for Beginners, my editor asked for a few changes. One of them was the ending. She said that all we needed to know was that Isabel was going start dating again and generally be OK, we didn't have to know whether Adam was going to be her soul mate. I changed the ending.
It's like the ending of The Italian Job and Michael Caine saying 'I have an idea...' That works because we know that somehow he's going to find his way out of this impossible predicament. Anthony Mingella changed the ending of the film version of The Talented Mr Ripley, but although different in feel, both the book and the film endings work because we know how Tom Ripley is going to carry on with his life - even though we don't know exactly what he's going to do. That's satisfying. Confusion isn't.