Grindhouse ultimately flopped at the box office, yet the legacy may prevail through all the movies it launched.  Already the fake trailers for Machete and Hobo with a Shotgun have been turned into full-length feature films.  Director Eli Roth promises that his trailer for Thanksgiving is next in line to expand to a movie.  Roth and his writing partner Jeff Rundell have scripted a "very extensive treatment."  They recruited Jon Watts and Christopher D. Ford to work on the screenplay based on their impressive work on the script for Clown, a horror film that Roth is producing.  Roth expects to produce a Thanksgiving screenplay soon.

Hit the jump to see what Roth had to say about the development process.

Roth told Behind the Thrills [via AICN]:

"Dude, it's gonna happen. I'm working with the CLOWN writers on it. We have a call scheduled for tomorrow afternoon. Jeff Rundell, my co-writer and I have a very extensive treatment. We finally cracked the story and how to make it really really scary, and the reason to do it, and I'm really excited about it. So the CLOWN script was one of the best scripts I've ever read, and we're like 'before Jon [Watts] shoots CLOWN, he has a window.' Chris Ford, who's movie ROBOT & FRANK just opened... Chris and John are going to write the screenplay with me and my partner Jeff, so we'll have a screenplay soon."

Thanksgiving is my favorite of the Grindhouse trailers, though much of that is due to the fantastically creepy narration voice.  Watch it here (NSFW):

You could talk me into a Don't movie if Edgar Wright wants to do it, but I politely request that Rob Zombie's Werewolf Women of the S.S. stays a trailer.