Transcript for When Filming Extreme Dares Ends Very Badly
We all love to watch epic fails, but is the quest to make the next viral video pushing some thrill seekers too far? You're about to see what it's like to live through a moment of crisis with a camera on, and what happens to friends on an adventure that takes a life threatening turn. Here's ABC's David Wright. Ready, set, go. Oh, man! Reporter: It must have seemed like a good idea at the time. Ready, one, two, three. Reporter: A natural slide down a glacier in Utah. Oh, no! Reporter: Good, clean fun for these 21-year-old human toboggans. Catching the scene from all angles. Isle a big believer in making memories. You only live life once. It's always good to have a camera on you, just in case something unexpected happens. Reporter: The quest for flory, driven in part by the hope to share the video on social media. I have to admit, I think the G G go-pro pushes me to try things a little more. You can look back and say wow, I can't believe I did that. Reporter: All well and good until -- one of them finds out this is not just a frozen water slide. I'm coming, dude. What did you hurt? Reporter: Randall Reese curled up in the fetal position, torn apart by the ice. Then, as his buddies try to come to his aid, Aaron speedy goes a little too speedily over a cliff. That's him, hurtling down over rocks and brush. Are you okay? Call an ambulance. Reporter: Before we hear anymore about them, it's worth pointing out they have already at this point joined a youtube category they didn't want to be in. Call them go-pro epic fails. A search term that brings up any number of blood curdling scenarios. I think if people didn't have a huge audience, maybe they wouldn't be taking as much of a risk. Reporter: These small mounted cameras have brought us too new heights as daredevils put them to the test. Often testing the simplest principle in physics. What goes up must come down. Base jumpers have made a career out of this. I guess the big question is, why? Reporter: He gives the classic mountain climber response -- because it's there. It really is the feeling of being like Superman, to be able to fly wherever you want. You think I want to go over there and boom, you do it. Reporter: He's a pro. The problem is, kids do try this stuff at home. Pushing the envelope and trying to be funny or more dangerous or do something that would be a wow factor more than your peer, because other people will watch it. Reporter: Austrian skydiver Felix Baumgarner took it to a new level from his platform in space, sponsored by red bull, a drop 24 miles down into the new Mexico desert. But it turns out the unplanned version can be just as entertaining. This small camera, dropping out of an airplane, spins like a top, all the way down, finally landing with a thud in the mud. The pigs apparently none the wiser to what almost just hit them. Check out this amateur level knievel as he tries to jump his mini between two ramps. Showing the driver's perspective as the vehicle comes down just short of the ramp. Tumbling down the fairway, you can almost hear every bruise. I think go-pro has the potential to show up in a lot of different venues. That's why parents theed to have this issue on the radar screen. Reporter: Which brings us back to the Utah boys. I was definitely scared. I didn't think I was going to stop. It was frightening. All I was doing was yelling for Devin. It was definitely a comfort to have Devin there. Reporter: Devin Fister, the only one of the three who did not suffer injuries. Take my shirt. Reporter: He gave Randall the shirt off his back to keep warm while they waited for the medevac to come. Randall, this is going to be a hell of a story. Reporter: A story captured on camera. It has lots of dirt on it. This thing almost caught you dying. Reporter: Randall broke his cheekbone and needed 23 stitches. What did they learn watching it all over again? These are the cliffs. You can see how big the rocks are. You hit those and went flying. I was able to see no matter how young or old we are, we are not invincible. I had no idea you were in trouble. I was just going to see where you were. And looking at that, it was an eye opener for me. To be able to reflect and to see dangerous things do happen. If you're not careful and keeping track of what you're doing, you could end up hurt. Reporter: It seemed like a good idea at the time. They're just lucky they lived to tell the tale. I'm David Wright for "Nightline" in Los Angeles.
This transcript has been automatically generated and may not be 100% accurate.