this is 19-year-old matt warnert. he's ripping it up going i've got to stay pretty fast in his bmw m-3. >> that's his car as a teen? generally teens have clunkers. >> a new one of these goes for something like 60 grand. this is a 2003 model that he bought for $19,000. he worked all through high school more than 40 hours a week to save up for this thing so he could go to south mountain park in arizona and do this. >> oh! >> yeah. let's see that again. ole matt here misjudged the turn, hits into these rocks, bounces all over the place. the air bag comes out and listen to how he reacts, because, again, this is his baby. >> oh, my god! oh, my god! >> i feel terrible for him. >> usually they say it knocked my socks off. it actually knocked his hoodie on his head. >> nobody was hurt. the car, not so much. matt describes it, total loss. those were big boulders that he wadded it up against. >> i liked what matt said. he called it a misjudgment of road caused the accident. but i have to also say, matt, you were going pretty fa