it's a chilly 29 degrees as shawn daivari heads to the airport on the hiawatha train line. >> light rail in minneapolis is as nice and clean as you can get. >> but on this day, nice and clean gets down and dirty when a car full of commuters has to contend with an unruly passenger. >> when i first got on the train, he was just kind of, like, randomly yelling out, cussing a lot and stuff. i sat up in my seat, put on my headphones, pulled out my tablet like i always do. there were a lot of kids and older people on the train and stuff which didn't bother me that much. i just thought it wasn't very polite. >> the security video is silent and low quality, but it appears from the man's body language he's getting more agitated by the second. >> he was just kind of moving up and down the trains not necessarily talking to one person, but just kind of being loud and obnoxious to anyone who was in earshot. i sat back, kicked up my heels. i have 20 minutes to ignore this man then things started escalating. >> when a train rolls into the next station, a request from a boarding passenger sends the agit