"How I Met My Boyfriend's Dead Fianc?e"
http://www.imdb.com/title/tt0785007/
It might take a second to really "get" what the movie must be about... And then, you read the "plot outline" on IMDB:
A ghost tries to sabotage her former boyfriend's current relationship with a psychic. :o ;D
Some of the IMDB'ers* are mentioning "Ghost" (of course) but also "Blithe Spirit" :o
And it's being brought to you by sitcom veteran writer Jeff Lowell (http://www.imdb.com/name/nm0523094/) :-\
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*I didn't know immature illiterate 13 year olds have even heard of Noel Coward! ;)
2007s "Snakes on a Plane".
I wonder if the whole movie is as creative as the title....