A zombie apocalypse, except instead of turning people into zombies the virus turns everyone into the protagonist's ex-girlfriend (who's some sort of microbiology researcher...there was a lab accident...etc. etc. etc.). This idea came to me in a dream (in which it was the plot of a Jim Carey movie that I was watching)I like that it's a Jim Carey movie. It's like an inverted Eternal Sunshine of the Spotless Mind.