Best Movie Endings

As the year's end draws near, I can't help but think of the greatest movie endings of all time. As the saying goes, "All good things must come to an end," and that's certainly true for good movies as well. Here are some films that end humorously, shockingly, creatively, or just plain beautifully: Casablanca, 400 Blows, Se7en, Ferris Bueller's Day Off, The Sixth Sense, The Graduate, The Godfather, and this one for all you maniacs!
What are some of your favorite movie endings? Or better yet, what are some absolutely horrible endings?

Comments
I tend to prefer happy endings, like the Princess Bride, or the Bourne Identity, Romancing the Stone, or Star Wars: a New Hope. I can't remember any bad endings.. its probably because I stopped watching those movies far before the ending.
It's hard to top the ending of "Pink Flamingos." How much IS that doggy in the window?
After I read the 1973 book on which the Princess Bride movie was based, I was never able to view the ending as happy again.
My favorite is still 2001: A Space Odyssey
I just read the Wikipedia article on The Princess Bride and it says there that both Kareem Abdul-Jabbar and Governor Arnold were considered for the role of Fezzik! Can you imagine how horrible either would have been?
Btw, I can't believe I forgot to mention my all-time favorite movie ending.
I tend to like the "twist in the tale" ending, both in literature and in film/video. Silence of the Lambs "got" me more than once (you know the part -- where they're staking out the house) ... though perhaps that's more the endgame than the end.
The Sixth Sense may only have been a shock once, but oh what a shock it was! And me just moved into a big old empty house. *brr*
On a completely different note, however, the ending of The 40-year-old Virgin left me in convulsions -- twice. The first time I had to sit in my car for 10 minutes with my husband waiting to stop laughing before I could drive home from the theater. The second, I thought my mom was going to break, she was laughing so hard. To this day, there's a certain song I can't hear without sniggering.
Thank you, Judd Apatow. Thank you, Steve Carell.
"Forget it, Jake. It's Chinatown."
The ending of SAW was appropriately twisted. I liked how it wasn't a typical "Hollywood ending."
But you've got to be able to stomach the rest of the movie to get there.
/*== ejk ==*/
My favorite movie ending is from "Gone with the Wind". Ret Butler's comment "Frankly, my dear I don't give a damn." I like the ending showing Scarlett's will to go on.
janetfm