In what appears to be becoming a common occurrence, an argument broke out in a store over face masks -- only this one took the violence up a notch. The incident occurred in a Florida Walmart after a masked man confronted an unmasked man. Surveillance video shows the two exchanging words before the unmasked man flips off the other man and pulls a gun from his waistband. The gunman then reportedly threatened to kill the other man before exiting the store, according to the Palm Beach County Sheriff's Office. In an effort to identify the gunman, sheriff's officials have posted photos of him on Facebook, writing, "You think you're big and bad because you pull out a gun?"