Joaquin Phoenix's dark, hyper-realistic portrayal of the Joker is causing backlash before the movie even hits theaters! Titled "Joker," Phoenix stars as failed comedian Arthur Fleck, who ultimately becomes the comic book villain. But some worry the dark movie could inspire violence by those who feel isolated, and like they don't fit in with society. Several victims of the 2012 mass shooting in Aurora, Colorado, are expressing their concerns in particular. Twelve were killed and dozens more injured in the massacre at a screening of "The Dark Knight Rises." One victim's mother called the new 'Joker' film a "slap in the face."