We are back now at 7:42, issuing an urgent warning to parents about a new and dangerous online trend. The fire challenge. Teens setting themselves on fire on purpose all for a thrill. Gio Benitez is... See More
We are back now at 7:42, issuing an urgent warning to parents about a new and dangerous online trend. The fire challenge. Teens setting themselves on fire on purpose all for a thrill. Gio Benitez is here with more. Good morning, Lara. Parents, you need to see this story even though some of the images may be hard to watch. A shocking trend so popular, there are nearly 33,000 videos online right now. This morning, the alert. They are the disturbing videos on youtube. This is the fire challenge. Teen after teen posting videos after turning themselves into human torches. All for a social media stunt. Watch, the teens first apply some kind of flammable liquid, like alcohol. Then flick that lighter. 16-year-old Fernando did it and burned his waist and neck. Now he's sounding the alarm, posting video of his burns as a warning, and speaking to our station in L.A. I couldn't see. You can't see. You just see fire, you can't see anything. Reporter:s danger for the thrill of it. I saw others fail, I thought I could do the same thing but last longer under the flame. I can't say anything else besides it was a dumb idea. Reporter: And this morning that dumb idea is landing kids all over the country in emergency rooms and sparking an urgent warning for parents everywhe everywhere. We're asking parents and other teenagers to sit down and talk the consequences. Reporter: And the trauma can be more than physical. Experts say in the mind, that image of fire can be tough to extinguish. It can create this feeling of risk that can be exciting in the moment, but then can also make some of the kids that we see have trouble with sleeping. They then become more fearful about other situations where they might be at high risk. Reporter: And we have seen this kind of thing before on the youtube with the cinnamon challenge, swallowing raw cinnamon powder, or drinking hand sanitizer to get drunk. But the fire challenge, perhaps the most dangerous. To hear them laughing, nothing funny about this. Not at all. Coming up, the mysterious death of Michael Johns.
This transcript has been automatically generated and may not be 100% accurate.