The following contains mild spoilers for Incredibles 2.
After 14 years of waiting, seeing Incredibles 2 is an exciting and suspenseful experience, but for some people with photosensitive epilepsy, migraines, or chronic illness, it may also be dangerous. A Twitter thread by Veronica Lewis went viral after an early premiere of the film, because she called out strobing effects and rapidly changing lights throughout the movie that could be unsafe. Veronica specified the scenes which, in a dark theatre, may be especially harmful to those who are prone to seizures, chronic illnesses, migraines, or other sensitivities. Other moviegoers also began issuing warnings to fans, calling out the intense, flashing, black-and-white lights, and asked Disney to acknowledge the safety concern.
While no official incidents of seizures have been reported as a result of the film, according to Variety, Disney has been notified and alerted all theatres showing Incredibles 2 to publish a warning for fans before they see it. This alert will hopefully help remedy any potentially unsafe situations, but just in case, read on to see Veronica's thread about which scenes could be harmful.