Which Horror Or Dark Fantasy Movie Has The Most Powerful Ending?

Most horror and dark fantasy movies can't quite stick the landing, when it comes to endings. People survive, or they die. But a few great horror movies actually manage to serve up endings with real weight, and catharsis to them. Which horror or dark fantasy movie has the absolute best ending?

Please include a picture or clip of your chosen movie. And please mention the title, and why the ending is so great. Thanks!

Top image: The Shining, of course.