You may have heard that Elton John is to produce a film called ""Pride and Predator where the gentile lives of 18th century people are disturbed by a vicious alien invasion. Even if the film sucks (and let's face it, it probably will), the title is excellent.
Anyway, how about some of your suggestions for other film amalgamations.
I'll get the ball rolling:
A Bug's Life of Brian.
The Man who would be King Kong.
They died with Das Boot on.
Godfather of the Bride.
Boyz in the parenthood.
The Breakfast Fight Club.
A nightmare on Green Street
The Englishman who went up a hill and came back down Brokeback Mountain.
Ben Hur it like Beckham.