Here’s one more reason to think twice about seeing the latest Twilight installment, Breaking Dawn, not that box office numbers suggest that many people have really thought twice about going. It’s not just that the film is a terrible one, or that it has some of the most horrific visions of sexual development and romantic relationships we’ve ever seen aimed at teen girls.

No, it is that the movie is reportedly causing seizures in some viewers. The explanation, which goes hand in hand with some Breaking Dawn spoilers, is below.

So, as you likely already know, Breaking Dawn features a horrific birth sequence. Or a comic one, I suppose, depending on how you look at these sort of things.

Bella (Kristen Stewart) is pregnant with a human/vampire hybrid that is demanding so much nourishment Bella has had to resort to drinking human blood to stay alive during the pregnancy. Labor doesn’t begin in the normal manner; rather the baby essentially starts to break its way out of Bella. Edward (Robert Pattinson) has to chew the baby out of Bella, and the entire sequence is shot and edited to enhance the horror of the moment, complete with strobing lighting and cutting that enhances that effect.

ABC reports,

Several instances of people saying they have developed seizures during the tense birthing scene in “Breaking Dawn: Part One” have been reported. The in-theater seizures, also known as photosensitive epilepsy, are thought to be a result of the bright flashing of red, black and white during the film’s nerve-wracking scene.

While watching the film half of one couple began “convulsing, snorting, [and] trying to breathe,” according to the man’s companion. He woke up on the floor of the theater and was removed by paramedics. We can’t verify that the prescription to prevent further problems was “go see Hugo,” but we can hope.