Violent clash between a customer and a Domino's delivery driver: she claims she has already paid

A customer violently attacks a Domino's delivery driver on the landing of her apartment building. She pushes him down the stairs after he asks her to pay in cash. The woman claims to have already paid for her order online, but the deliveryman insists on receiving the money. The situation quickly escalates and she chases him down the stairs. The scene was filmed and went viral.