From the Brooklyn Heights Blog (and just about everywhere else):

I was in the Montague St Starbucks at 10:20 am today, maybe 10:25. A man outside had a baby in an upright-type stroller and was speaking with a woman who seemed very concerned. It seems that his child was fussing in the stroller while the man ( who I will call “Dad”) was waiting for his drink. When the baby kept crying another man complained to Dad: when Dad did not leave and stayed to wait for his drink, the non-dad man slapped Dad on the back of the head.