I first heard about it from Rain’s blog, but some people on the Straight Dope did some digging to find out more about it. Apparently it’s been going around the internets and has made an impression.
What it is is a new trailer for The Shining, using clips from the movie (except for one cheat piece of dialog). And it’s genius, one of the best things I’ve ever seen on the internet. Bonus points for including the kiss and the choice of music. I can’t stop watching it.
The New York Times did an article about it with more info and an interview with the guy who made it.
On the same site, there’s a trailer for West Side Story as a horror film, but it’s not as good.