Do YOU want to write a script that is guaranteed to be filmed but will be disliked by everybody?
First you should go through your files and find a script you've already written, but which you didn't like much, or maybe it got rejected. This script could be about -- for example -- a deadly organism sent through a wormhole in space, and a bunch of scientists who try to unravel the mystery of how and why it arrived.
Then, when you're reading this mediocre script to your wife, maybe she could say "Hey, that sounds a bit like this book I read once...what was it called...The Gemini Strain? The Sirius Strain? Sort of like that, but less interesting."
Brood. Feel sorry for yourself. But when you hear that some producers want to remake Michael Crichton's "The Andromeda Strain," jump in and say "I'll do it!" and then just grab the set-pieces from Crichton's novel and mix them with your old script. It doesn't matter if none of them fit together. It doesn't even matter if doing so waters down (or completely removes) any of the interesting bits of Crichton's book, such as the actual BIOLOGY of the organism or the blatant "if it can go wrong, it will" theme. Get rid of that stuff and replace it with up-to-date science, like computers you can converse with in plain English and hilarious "ePaper." Don't forget the Buckyballs.
Suddenly you find out that this is going to be a FOUR HOUR MINISERIES! Open your textbook of American Character Archetypes and assign one to each person in the script (stuff like "father is too busy but still loves his son anyway" and "would do anything for her country EXCEPT sacrifice her family" and "no-nonsense, brilliant female surgeon waiting for a man of her caliber"). You need to do this to replace all that science stuff you took out. Make everybody twenty years younger, and cute. Because the best scientific minds are always young and cute, you know. Make them fall in love.
Having done all this, choose to make the story TOPICAL, whether it wants to be or not. Throw in everything that you read about in yesterday's newspaper, especially terrorism and offshore drilling (errr, "mining undersea vents," rather). Make the script exceptionally critical of all the illegalities and excesses of the Bush administration, but because you don't want to end up defending yourself against Ann Coulter on a talk show, replace President Bush with a likable man who says things like:
AIDE: We can evacuate your wife and child immediately, sir.Oh! And don't forget to Always Support The Troops.
PRESIDENT: And what about all the OTHER wives and children? Huh? What about them? GET OUT OF MY SIGHT!
But...how should it end? You need a climax. Better yet, you need four climaxes simultaneously! One of these climaxes should involve an acrophobic who has to catch the severed thumb of a closet homosexual war-monger, which was cut off and thrown to him by a man who is epileptic and dying in a pool of radioactive water. Because it's that kind of movie.
Finally, at the bottom of your script, write "Crap CGI only!" and underline it.