Get a good movie & try to pitch it in the worst way you can think of.
For example.
One flew over the Cuckoos nest.
Well basically it's about a guy who gets lobotomized & his mate chucks a fountain through the window.
Pitch a good film - badly
Se7en.
It's about this whiny couple who have a tiny flat and two inexplicably massive dogs. And it rains.
The Terminator, a precautionary tale about the unintended consequences of a one night stand.
Titanic, a crap boat.
Quote: Leevil @ February 13 2010, 6:38 AM GMTTitanic, a crap boat.
2001: Space Odyssey, some bloke turns off a computer.
Avatar. It's blurry unless you wear these special sunglasses.
Eternal Sunshine of the Spotless Mind.
'Huh?'
Castaway
A postman, on a island, with a ball.
E.T - A small wrinkly person shows his glowing finger to a child. They all cry at the end.
The Goonies.
A deformed man helps a fat kid and his friends find a secret place. 
Jurassic Park
A theme park owner invites a pair paleontologists to view his opened attraction.
Scooby Doo
Four youths and a dog hassle a theme park owner.
Taxi Driver...