Customer shot KFC employee after being told store ran out of this menu item

An employee at a St. Louis KFC was shot by a customer - because they were out of corn. Police say the suspect was in the drive-thru line when he was told the restaurant was out of corn. He began making threats, then drove up to the window with a gun and shot an employee who went outside. The victim was hospitalized and is in critical condition. The suspect, described as a man in his 40's or 50's, is still at large. What's the most outrageous behavior you've ever seen at a restaurant?