People heading to the movie theater to see The Incredibles 2 might notice a warning sign that theaters are being asked to post near the ticket booth.
The warning lets people with sensitivity to light, or those who have epilepsy, know about scenes in the film which could trigger a seizure.
Moviegoers on social media are claiming it's cause headaches, blackouts, even epileptic seizures.
"It's a good thing to have it," said Erica Monroy, who was planning to bring her daughter to see the movie. "It covers them, covers a parent if you have a child that has something like epilepsy."
Kenneth McBroom, who manages the Britton Plaza theater in South Tampa, says he's putting up the warning sign after having noticed the effects himself.
"Yeah, it makes you woo," he said blinking his eyes and waving his arms.
Even after a busy weekend with no problems, McBroom thinks it's the right thing to do.
"We don't want parents to freak out," he said.
The biggest concern is for people whose photosensitivity can trigger a seizure from what's called reflex epilepsy.
"It's a certain type of light. Shape, patterns that can induce it," said Dr. Jose Ferreira, who practices at the Pediatric Epilepsy and Neurology Specialists office in Tampa.
He demonstrated how certain light frequencies can cause a patient to have seizures.
But Dr. Ferreira says only about 1% of the population has epilepsy, and only 3% of that 1% have this type of issue. And even among that small number, different people react to different light frequencies. So, in his professional opinion, Dr. Ferreira doesn't see any reason to skip the film.
"I would say that it is most likely safe to go to that particular movie," he said.
The issue is not unprecedented.
In 2011 there was a movie that the Epilepsy Foundation of America warned its members not to see. Nine people reported having a seizure during a particular scene in the film.
Also, in 1997, dozens of kids in Japan were said to have had issues after watching a particular episode of the animated series Pokémon.
Dr. Ferreira says reflex epilepsy is almost always inherited. He also says polarized glasses sometimes help patients with photosensitivity issues. He says a lack of sleep, stress, and failure take medication can leave people more vulnerable to photosensitivity seizures.
But a widespread effect from the movie? Well, that he would find - incredible.
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