Just a theory..

..but, i think they may be actually testing some sort of mind altering substance in the subway tunnels of NYC. Its a perfect place to do it, and it wouldn't be the first time, right? What let me to this?

this article:
Subway Rider Sliced in Power Saw Attack

A man grabbed two cordless power saws off a subway station workbench and went on a rampage Thursday, swinging the saws at riders and slicing open a man's chest before running away, police said.

The 64-year-old victim, whose name was not released, was hospitalized in critical but stable condition. Police were searching for the suspect, described by witnesses as a thin man in his 30s, who had earrings in both ears and was possibly carrying a teddy bear.

Wielding a saw in each hand, the man took a swipe at one rider on a platform and missed, police said. Moments later, he cut into the man's chest at a turnstile before bolting out of the station, still carrying the power tools, which were later found in a trash can.

The attack came two weeks after a Boston man was charged with stabbing four people _ three of them tourists _ over a 13-hour period in the subway and the theater district in Manhattan.

Just seems weird, people going on completely random murderous rampages.