I had to do it before someone else did
As mentioned before, the original Italian Job has a fantastic ending
I also liked
The Prestige
Raiders of the Lost Ark
V for Vendetta
I am tempted to say Cloverfield too, simply for the last words as "something" crashes into the sea in the background
Texas Chainsaw Massacre (the original where she totally loses her mind)
The Terminator (there's a storm coming)