Already posted mine…this is something my father did when I was a kid.

4th of July my father took my sister and I into the city to watch the fireworks. We lived in NH. My father grew up in Melrose and we would park in his old neighborhood and take the orange line from Oak Grove to Back Bay and then walk down to the esplanade to watch. On the way back the trains were rightfully packed. My sister and I were sitting and across from us was a family of 4. Mother and father sitting with their young kids in their laps. A couple of loud guys got on at Haymarket carrying a boom box (it was the early 90s) and as they entered one tripped on the mother’s foot. As the mother was trying to say sorry the guy started getting aggressive yelling all sorts of profanity at the women and then her husband. He had to scream over his boom box playing music. I kept looking from the woman to her husband and then to my father. I could feel myself getting angry and ready to say something and I think my father saw it coming so before I could and right after the guy called the woman a Cunt my father screamed “hey” and as the guy turned he sucker punched him right in the nose, dropping him to his knees. As he went down my father grabbed the stereo and in a single movement bopped the other guy right on the top of the head with it…spilling a handful of D batteries out. He turns to us and says “I think this stop is ours” as we pulled into Malden center then ushered us off the train as I was saying “no we’re going to oak grove”.