You know what zombie movie I'd totally see? Zombies on a cruise liner. All those rich toffs getting turned into delicious undead pate while the captain sits up on the bridge in the foetal position trying to ignore the incessant banging and screaming from the decks below. Cue the plucky machine-room mechanic who rises up with a band of economy-class survivors, pushes all the zombies overboard through ingenious MacGyver-esque devices then gets the girl and plays shuffleboard for the remainder of the journey home. Then goes to jail for mass murder because who ever heard of a whole cruise turning into zombies and being pushed overboard?
Mokalus of Borg
PS - For the sequel: zombies on a submarine. Pretty much the same plot.
PPS - The zombies got to the ocean floor when some git on a cruise liner pushed them overboard without cutting them into pieces first.