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One of my personal favs was the ending of "Death Wish". Bronson stares down a trio of punks, points his finger like a gun, and "fires" with a sadistic grin on his face. I also enjoyed the very clever finale to the original "Pelham 1,2,3".
One that left me very satisfied was the end of "Inglorious Basterds"; quite awesome.
A few endings I wasn't crazy about:
The Hills Have Eyes (original and remake).
Wendigo (I didn't get it).
Friday the 13th Part II.