I can't narrow it down to one but here they are!
The Shining (Book)
Tengen Toppa Gurren Lagann
Fooly Cooly (Books)
The World Ends With You
And that's all i can think of at the moment!
The Shining (Book)
A fucking hotel explodes and you find out Tony is Danny from the future, what more do you want!?
Tengen Toppa Gurren Lagann
The begining of the epic ending is when they are trapped in alternate realities created in their own mind and Kamina pulls everyone out of them. After which they turn into a kickass robot big enough to throw planets as weapons. Finally when all is said and done, Nia dies at the wedding. Then Simon walks away forever, to be seen one more time as what looks like a gypsy telling a boy how to open a coconut with a drill.
Fooly Cooly (Books)
Now, some of you may be saying "Wait! The ending for FLCL had no closure!" but i think it had just enough. You learn that in one way or the other Atmosk was Naota's brother, Haruko leaves without warning but comes back to say goodbye and gives him the vespa to come find her someday. Not to mention his face explodes and a cat comes out of it.
The World Ends With You
This game had the most amazing ending ever, no questions asked. Mr. H was an angel sent to make sure nothing went wrong in the game, but to make sure shibuya wasn't destroyed he had to bring Sho back to life. So he became a renegade angel. Not to mention, the whole game you have been fighting to wipe your hometown from the face of the earth, and that you were merely Joshua's puppet. Joshua turned out to be the composer and wanted to rid his hands of shibuya, the guy you were fighting was trying to save it. And the end is Joshua seeing how much Neku had changed in the past three weeks and had decided to let it stay. Although, i think Mr. H had more to do with that, the secret ending gives me that feeling.
And that's all i can think of at the moment!