A customer in the return line got into an exchange of fists on Sunday at the Dulles Town Center Sears.
While waiting in line at the store, police said a customer made "disparaging remarks" about the staff. The Loudoun Times-Mirror reported that the comments were "racist" in nature.
According to authorities, another man standing in line took issue with the negative comments, and an argument ensued. Words turned into blows, as the first man threw the other into a clothing rack.
The victim, a 39-year-old man, declined medical attention, but went to the hospital later, where he was treated for serious but not life-threatening injuries.
The Loudoun County Sheriff's office described the assailant as 6'3'' tall, with a heavy build, brown hair, and wearing a goatee beard.
The British have already coined a term for this kind of attack - "shopping rage."