Just been having a read through these, raised a chuckle or two. Basically it's the premise of various films/comics etc distilled into one snarky sentence. Favourites include:
ALIENS: An unplanned pregnancy leads to complications.
BATMAN: Wealthy man assaults the mentally ill.
BLADE: Obsessed loner stalks minority group.
SERENITY: Men fight for possession of scantily clad mentally ill teenage girl.
RAIDERS OF THE LOST ARK: American yahoo murders soldiers and desecrates religious artifacts for money.
STAR WARS: A NEW HOPE: Religious extremist terrorists destroy government installation, killing thousands.
TERMINATOR: An unplanned pregnancy leads to complications.
And slightly more on-topic -
JUDGE DREDD: Fascist thug in bleak dystopia is cheered.
Link: //http://www.postmodernbarney.com/2009/04/uncomfortable-plot-summaries/
Texas Chainsaw Massacre

eranged Lunatic with anger management issues mis-uses chainsaw.
The Exorcist :Young girl with behaviour problems gets sent to bed and verbally abuses priest and makes improper sexual suggestions.
Blade 2 :A bit like the first but not as good but features a very fit looking female vampire.
Liked this one at the bottom of the page.
WATCHMEN: Homosexual destroys New York, blames God.
Sppokily enough- I was trying to do this very thing at work yesterday with the plays of Shakespeare.
The best one I could think of was for Hamlet: Emo might kill uncle.
Merchant of Venice: Cross-dressing anti-semitic lawyer bails out investors.
And specially for House of Usher:
Macbeth: Mad bitch in murder suicide pact.
2000ad : Immigrant with eating disorder predicts violent future
Terminator 3 :Hostile takeover by machine led military industrial complex with an unethical and unsound enviromental policy.