Lady In The Water - New Shyamalan

Splash 2: Electric Boogaloo.
Except the pool is from the 19th Century and the nymph is a superhero who sees dead people.

shamma-lamma is so passe

next!

... and your film is coming out when, Edison?

The twist is out. This from Yahoo movies:

Given that, my left field guess here is something along the lines of the superintendent discovering that instead of the sea nymph being in his pool of water, he's actually in her pool of air. : )

You heard it here first.

She turned me into a newt. :eek

Finding a sea nymph in your pool? That's not so bad. How about finding a grey, furring thing growing in a tupperware container in the back your refrigerator? Now that's scary!

Sounds like somebody dropped ET into the pool!