Plough and Stars --not really in Harvard Square-- is one of the best bars in the world, but it brings into ultra-high relief not only the pleasures but also the considerable hazards of bar culture in general: it's full of criminals, and they will rob you or even kill you. As I was once a habitue, I can easily but reluctantly support this claim with anectodal evidence ... but a look at the police blotter for this place should be enough.
Enjoy, but be wary.
Enjoy, but be wary.