This is fun.
Here’s what I came up with when I used it:
The Gunslinger
an original screenplay concept
by LookitMe
Western: An antisocial loner teams up with a cute dog named Jake to solve the perfect crime. In the process they rescue a kind hearted prostitute. By the end of the movie they run away from two hundred bad guys and end up winning the admiration of their country, living happily ever after.
Think Die Hard meets Silverado
Ah, this’ll get old really fast. 
A Place In The Moon
an original screenplay concept
by Zeldar
Black comedy: A struggling artist teams up with the straightest cop on four continents to investigate dirty cops on the take. In the process they accidentally kill four British men on welfare. By the end of the movie they buy 6 double agents and end up winning the admiration of their co-workers, living happily ever after.
Think It’s a Beautiful Life meets Shane.
Hard Weapons
an original screenplay concept
by FairyDust
Action: A renegade cop teams up with the straightest cop on four continents to investigate dirty cops on the take. In the process they have mad passionate sex with a rookie cop. By the end of the movie they blow up fifty cars and end up winning the admiration of their department, living happily ever after.
Think Die Hard meets Lethal Weapon.
Here’s one of my favorite Plot Generators.
http://www.visi.com/~sgrantz/plot.html
Basically it generates movie plots (with appropriate accompanying “stars”) that are usually seen at 2:00 a.m. on Cable.
          Bikini Justice
A frustrated housewife (Shannon Tweed) shows a surprising lack of tanlines in a wet and wild roller coaster thrill ride. Fired from his job, a lawyer (Jefferson Wagner) likes what he sees in her efforts. David Carradine plays Jiggles, a transvestite clown.
Well, I think you get the idea.
Godzilla vs. The Martians
an original screenplay concept
by Barry
Science Fiction: A shell-shocked war vet teams up with a kind hearted prostitute to save the earth from aliens. In the process they accidentally kill a super intelligent chimpanzee. By the end of the movie they burn 17 oogly aliens and end up winning the admiration of their world, living happily ever after.
Think Waterworld meets Matrix.
Out of time
an original screenplay concept
by Baker
Science Fiction: A pimply computer nerd teams up with a well-built female cyborg to save the earth from aliens. In the process they rescue a nun. By the end of the movie they chase 5 oogly aliens and end up winning the admiration of their universe, living happily ever after.
Think Priscilla, Queen of the Desert meets Schindler’s List.
Deadly Pursuit
an original screenplay concept
by Mr. Clueless
Political thriller: A sexy district attorney teams up with an alcoholic ex-CIA agent to investigate dirty cops on the take. In the process they turn state’s evidence on her partner. By the end of the movie they blow up 26 trains and end up winning the admiration of their country, living happily ever after.
Think sex lies and videotape meets jaws
In the Land of the Blind
an original screenplay concept
by Ryan
Action: A sexy district attorney teams up with the chief of police to commit the perfect crime. In the process they accidentally kill a rookie cop. By the end of the movie they blow up 352 double agents and end up winning the admiration of their world, living happily ever after.
Think Die Hard meets Black Hawk Down.
Happy Donut
an original screenplay concept
by HPL
Western: A renegade cop teams up with a kind hearted prostitute to save the earth from aliens. In the process they are locked in a haunted house with four British men on welfare. By the end of the movie they run away from 172 washed up ex-SNL cast members and end up winning the admiration of their dog, living happily ever after.
Think Clerks meets Godfather.
It’s so crappy, I expect it to be purchased by a movie company soon.
I couldn’t give a crap
an original screenplay concept
by Green Bladder
Drama: **A sexy district attorney teams up with an alcoholic ex-CIA agent to win a wager. In the process they betray a nun. By the end of the movie they have sex with 452 oogly mothers-in-law and end up winning the admiration of their dog, living happily ever after.
Think Ernest Goes to Camp meets Shwashank Redepmtion.**
That has ‘blockbuster’ written all over it 
THE SHAWSHANK REDEMPTION
:smack:
No Hope
an original screenplay concept
by Lisa-go-Blind
Black comedy: A pimply computer nerd teams up with a kind hearted prostitute to discover America. In the process they betray four British men on welfare. By the end of the movie they burn 64 cars and end up winning the admiration of their country, living happily ever after.
Think sex lies and videotape meets Rushmore.
Oh, I smell an early-summer blockbuster
Big Action Movie
an original screenplay concept
by Beelzebubba
Action: An antisocial loner teams up with a fellow hostage who happens to have a black belt in karate to find the true meaning of love. In the process they accidentally kill a kind hearted prostitute. By the end of the movie they run away from 7251 cable cars and end up winning the admiration of their parents, living happily ever after.
Think Ernest Goes to Camp meets JFK.
the porterhouse solution
an original screenplay concept
by spooje
Political thriller: An antisocial loner teams up with a kind hearted prostitute to investigate dirty cops on the take. In the process they accidentally kill a gay interior decorator. By the end of the movie they blow up 17 bad guys and end up winning the admiration of their kind hearted prostitute, living happily ever after.
Think sex lies and videotape meets Memento.
Pearl Harbor
an original screenplay concept
by Jerry Bruckheimer
War movie: A war hardened soldier teams up with a kind hearted prostitute to find the true meaning of love. In the process they rescue his partner. By the end of the movie they shoot down over 100 Japanese planes and end up winning the admiration of their country, living happily ever after.
Think Gone With the Wind meets Tora! Tora! Tora!.
A Good Day to Die
an original screenplay concept
by Skammer
Period Piece: A war hardened soldier teams up with a kind hearted prostitute to commit the perfect crime. In the process they sign a suicide pact with Parker Posey. By the end of the movie they run away from 5 double agents and end up winning the admiration of their dog, living happily ever after.
Think It’s a Beautiful Life meets Braveheart.
Well, I ain’t quittin’ my day job anytime soon.
The Running Wabbit
an original screenplay concept
by CPoI
Black comedy: A washed up prizefighter teams up with an alcoholic ex-CIA agent to find the true meaning of love. In the process they accidentally kill a super intelligent chimpanzee. By the end of the movie they beat up 5123 washed up ex-SNL cast members and end up winning the admiration of their 3rd grade teacher, living happily ever after.
Think Clerks meets Scarface.
I’d shell out $8.50 to see that one.