Evidently

"Mister Days has long been a problem, and now that someone's ear has been bitten off, it's evident that things need to be addressed," Weinress said, adding that the fight was one of a series of disputes fueled by alcohol.

From a Washington Post article about alcohol-fueled trouble brewing in the suburban entertainment hotspot that is the Clarendon neighborhood of Arlington (or Barlington, which is my term that will catch on some day.)