Blake Lively's shark attack movie is terrifying -- but the movie-going experience shouldn't be.
A 21-year-old man was stabbed "several times" during a showing of The Shallows at the Roxy Theater in Santa Rosa, California, on Thursday, the Santa Rosa Police Department reported on their Facebook page.
"The suspect, who was unknown to the victim, approached him from behind and stabbed him several times in an unprovoked attack," the post claims. "Witnesses tended to the victim's wounds until police officers and emergency medical personnel arrived."
WATCH: Blake Lively on Filming 'The Shallows': 'There Wasn't a Single Scene That Wasn't Stunt-Heavy'
The unnamed victim was transported to a hospital "for multiple life threatening stab wounds," the Santa Rosa PD wrote and, in an update on Thursday, they shared news that he is "expected to survive."
Meanwhile, officers detained Delonte Hart, 23, who was taken into custody for attempted murder. Hart had allegedly been homeless in the Santa Rosa area for multiple months.
"We would like to thank the witnesses who so quickly came to the victim's aid and also provided detailed descriptions of the attacker," Santa Rosa PD said. "Their actions during and after this random and frightening attack allowed our officers to capture the suspect so quickly after the crime."
This is but the latest tragedy to occur in a movie theater: Last July, a shooter opened fire in a Louisiana theater screening Trainwreck, killing Mayci Breaux, 21, and Jillian Johnson, 33. The film’s star, Amy Schumer, has since passionately spoken out for stricter gun laws.
See Schumer's latest selfie to raise gun violence awareness in the video below.