Fade to black.

Here's a great video countdown the ranks and comments on the most iconic movie endings in cinematic history. We agree with much of this sincerely. 

1.) Planet of the Apes
2.) Psycho
3.) The Usual Suspects
4.) The Godfather
5.) Casablanca
6.) Chinatown
7.) Raging Bull
8.) Citizen Kane
9.) The Graduate
10.) Se7en