Been living here a while. Rode the subway a bunch. At least a couple thousand times or so. 

Seen a lot of stuff.

Seen sudden outbursts of violence over nothing.

Seen cruelty and seen indifference to suffering.

Seen all sorts of human waste product left behind by people who lost all control.

Sources: Gothamist | @meandtherhythm on Twitter | h/t Gawker