For this Friday the 13th let's flash back to a scary -- as far as brawls go -- benches-clearing incident between the Dodgers and Diamondbacks on June 11th of 2013. Ian Kennedy plunked Yasiel Puig in the face; Zack Greinke retaliated by hitting Miguel Montero in the back; and Kennedy came back and nailed Greinke in the shoulder. The benches cleared after the second and third beanings with the latter clearing leading to an actual baseball fight.
I very much remember watching that night and being amazed that baseball players were actually fighting.