There's ample overacting by the likes of Stella Stevens, Ernest Borgnine, and Shelley Winters, but the movie's one-obstacle-atop-another plot—and active meditation on faith—remain sharp and surprising.

Once the lady in question is overturned by a freak tidal wave the tone shifts from unintentionally comedic to undeniably exciting as renegade priest Gene Hackman leads a motley band of souls (including Ernest Borgnine, Shelley Winters, and Roddy McDowall) on their upside down quest to escape from a watery grave.

The Poseidon Adventure is a highly imaginative and lustily-produced meller that socks over the dramatic struggle of 10 passengers to save themselves after an ocean liner capsizes when struck by a mammoth tidal wave created by a submarine earthquake.

The effects here run the gamut from grandiose to goofy, but watch the upside-down ballroom sequence again. It's a set piece of pure destructive bliss, set to a symphony of screaming and breaking glass. Awesome.

A well thought-out script and fine direction keep a steady amount of tension, which doesn't let up until the survivors are rescued.