Glockgirl has a great game over on her blog. You'll see a movie still with pieces from two different movies in it, combined to make one new title -- and you have to guess what it is!
Here's an example from her:

This shot has Albert Brooks from "Defending Your Life," and Kevin Kline in "Life as a House." So the combined title -- and the answer! -- is "Defending Your Life as a House."
My images aren't nearly as good as hers, but I'll share anyway. Guess away!
#1:

The Importance of Being Ernest Goes to Camp,
guessed by Deuce
#2:

The King Kong and I,
guessed by marnie78
#3:

Plan 9 From Outer Spaceballs
Almost correctly guessed in person by several people.
#4:

The Little Shop of Horrors Around the Corner,
correctly guessed by deuce
#5:

Dirty Harry and the Hendersons,
correctly guessed -- surprise! -- by deuce
#6:
Cast Away We Were,
correctly guessed by taffy70