I never actually watched this movie just saw a couple of seen while my mom was watching it when i was a kid (early 2000’s) from what i can remember its set in a small town that has a theater. teens start dying randomly, a group of nerds soon figure out that everyone who’s died had seen a specific new horror film in theaters and when they went to investigate the film roll they found a couple of frames were empty or it had a face on it but you couldnt actually see it while watching the movie. one of the death scenes is at the school swimming pool a girl or boy goes into the showers and when he/she hears a noise they think its their significant other but really it isn’t and they die. this is pretty much all i can remember thanks in advance.
The Wisher (2002) (AKA: Spliced)?
http://www.imdb.com/title/tt0354216/?ref_=fn_al_tt_4