The assault came weeks after President Clinton asked the movie industry to tighten enforcement of the film rating system.
Police believe one of the attackers was a teen turned away twice from the box office.
The clerk asked for identification, but they were unable to show any and left. The teens returned later and only the girl showed the clerk identification. The clerk refused to sell the ticket to the boy, who became belligerent and was ordered off the premises. As the clerk was walking to his car after work, three men punched him in the face and took away his car keys. The car keys were later found in the parking lot and police do not believe robbery was a motive.