Gyllenhaal, who lost 20 pounds to play a crime reporter in the film, was deep in character when he accidentally hurt himself by hitting a mirror, People reported Thursday.
"His character was looking into a mirror during the scene and punched the mirror in anger and broke it, cutting himself so bad he had to be taken to a hospital," a source told the mag.
The trip to the emergency reportedly included a bunch of stitches (which pales in comparison to
Note that it was the character, and not the actor, who nailed the mirror. As in, don't go thinking that Gyllenhaal was pitching a diva fit on set.
Ever the trouper, Jake returned to work after his ER visit. "Nightcrawler" is set for release next year.