This week, we're taking it to the screen with Alien vs. Predator: Requiem, the latest mash up of modern sci-fi's two coolest franchises in a winner-take-all battle royale. Why are they duking it out on Earth? Why not? Just check out some of our eternal feuds. Boys versus girls. Cats versus dogs. The left versus the right. Fresh versus rotten. Seeing how the world loves to crash opposites against each other and watch the sparks fly, here's a sample of 10 more memorable title fights, all taking place in the silver screen coliseum. Get your tickets (and DVDs) now!

Wife Versus Secretary (1936)

The set-up: Clark Gable stars as Van Stanhope, magazine industrialist with a godsend of a secretary named Whitey (Jean Harlow). Talk slowly bubbles that a secretary that gorgeous can't be without some special talents not listed on her resume, which begins to influence Stanhope's wife, Linda (Myrna Loy). Stanhope digs himself deeper into trouble with wife through a series of delightful misunderstandings in this prime example of old Hollywood upscale comedy and sharp ratatat dialogue.

Winner: Secretary. Everybody gets their happy ending, but I honestly never trusted Clark Gable, what with his pomade-doused hair and creepy thin mustache. The secretary gets the better deal -- she drives off into the evening with her beau, played by a little known actor named James Stewart.

Gamera vs. Monster X (1970)

The set-up: Never mind the mindless lumbering and random fire belching of Godzilla, give me Gamera the turtle any day. Gamera has motivations. Feelings. Now if only the helpless citizens of Japan could figure out what those were. In Gamera vs. Monster X, excavations on a small island accidentally resurrect Gamera's nemesis, a scaled lizard that can microwave buildings with a heat ray and shoot pointy things from its horns. In comes Gamera to save the day, never mind that Japanese army is constantly trying to murderlize his hide. The movie hits its high point when Gamera gets injected with Monster X larvae and two children (children always sympathize with the misunderstood gentle giant) take a mini-sub into his lungs for some emergency surgery.

Winner: The global community. May we always have enormous rubber monsters and bugs to admire!

Kramer vs. Kramer (1979)

The set-up: A box office success, now somewhat unfairly marginalized as one of those Best Picture winners that stole the award from clearly superior movies (in this case, Apocalypse Now). Dustin Hoffman and Meryl Streep star as Ted and Joanna Kramer, a New York couple whose marriage is shaken when Joanna suddenly leaves Ted and their son, Billy. Indeed, this is no Apocalypse Now. But it is a clean-cut melodrama with tense domestic scenes as Ted and Billy slowly assemble a relationship. The title fight refers to the third-act custody battle that ensues when Joanna returns as a more whole woman and demands her child back.

Winner: Kramer.

Joe Versus the Volcano (1990)

The set-up: Tom Hanks made a lot of weird comedies during his early "funny" period (The 'burbs, Bonfire of the Vanities, Splash), but none were weirder than Joe Versus the Volcano. After a fantastically stylized intro depicting the daily grind of factory life, Tom Hanks' Joe goes to a Pacific island on a business trip where he meets Meg Ryan (their first pairing), makes a raft out of steamer trunks (twice!), gets married, and sacrifices himself to the volcano to appease island natives.

Winner: Tie. In a cute plot twist at the end, both Joe and the volcano get their final comeuppance.

Godzilla vs. Destroyah (1995)

The set-up: Since only the most devoted geek can keep track of all the Godzilla flicks since the 1954 debut, the franchise reboots every several decades to renew interest and attract new fans. In the final installment of this mini-series (which ran approximately from the mid-80s to 90s), Godzilla faces one of his toughest (and most popular) enemies: Destroyah, a crustacean mutated by the Oxygen Destroyer that defeated the original Godzilla. Intriguing fact: 1995's production values for monster movies seem to be even less than in 1954.

Winner: In a rare TKO, Destroyah survives long enough to witness Godzilla succumb to total nuclear meltdown. But then enters Godzilla Junior...