This is the shocking moment a McDonald's customer is headbutted by an employee after an argument broke out - over CHICKEN NUGGETS. The 26-second footage, shows the unnamed male employee, who appears to be in his early 20's, grabbing a customer before headbutting him. The video was captured at around 4.50am this morning as the regular menu turned to breakfast at the outlet. A source who captured the video said: "The fight broke out because the menu was turning to breakfast and they didn't have any chicken nuggets.