Black Friday started on Thursday at many stores this year, and across the country there were reports of people lined up for those big 'door-buster' deals. 

Most of the video we're receiving from affiliates here at HLN show fairly orderly, even happy, scenes of shoppers doing a little retail-cardio to burn off those sweet potato pie calories, but there have been some exceptions.

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At a Kmart in Sacramento, one shopper threatened people. "Push one of my kids and I will stab one of you [expletive deleted]," he yelled. Several people laughed at his threat, but according to affiliate KTXL he said he wasn't joking. Everyone did get into the store safely.

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A lot of the hostility last night seems to have stemmed from vouchers or tickets store employees handed out to people in line. You needed to have one if you intended to buy certain hot-ticket items. Some people who got them turned around and sold them. There was even a fight at another Kmart over a TV.

In Los Angeles, hundreds of extra police have been out to control crowds. The city has officers on horseback and even on rooftops looking for troublemakers.

Morning Express with Robin Meade airs Monday through Friday at 6 a.m. ET on HLN.  Like the show on Facebook, follow on Twitter: @MorningExp.