. >> we see a skop on the oath ever side of the road.ive him a wave like a little just like, oh, right there. >> there's a cop. >> thank god a cop got him, dude. >> i go, walk up to that cop and tell him we were following him and we were, like, have video of him and stuff in case they need any, like, evidence to give him a dui or anything. he actually yelled at me, go sit on your car. >> we might have annoyed the cops and whatnot, but i think we helped. >> the driver is convicted of driving under the influence. they post the video footage from that day on youtube. it quickly racks up more than 70,000 views and hundreds of comments. >> a lot of people said it was good that we did it. but there were some of them that were, like, oh, you guys snitched. we're not just a bunch of kids. we actually care about everyone. and we try and do the right thing. >> one night you can just end your life and it's just not worth it. so pay a taxi. walk. just do anything. just don't drink and drive. >> oh. dude. >>> coming up -- a man comes home to an alarm