Catherine Aliaga, 38; and Tarsha Williams, 33, began shouting and fighting during a birthday celebration for Aliaga's son during the weekend, Gatehouse News Services reported.
"Unfortunately, a birthday night out turned into a birthday melee," police Sgt. Paul Thompson said. "I don't even know if they finished their pizza."
Aliaga was reportedly upset about Williams' 13-year-old son playing a basketball arcade game at the Natick, Mass., Chuck E. Cheese for a long time, the sergeant said. Aliaga told her son to be patient while the other boy had his turn with the game.
Williams' son apparently pushed the boy, who accused him of "hogging" the game, the news service said.
"Next thing you know words were exchanged," Thompson said and escalated to fisticuffs, the Gatehouse report said.