A few years ago, we had some criminals randomly stabbing people in crowds with hypodermic needles. I just tried to find an article about it; but I can't narrow the search easily with the keywords new york, hypodermic needle.
Terror Fears Sparked After Device Found In Philly Rail Yard
POSTED: 11:02 am EDT May 21, 2004
PHILADELPHIA -- A small electronic device was found in a rail yard last week, but officials said they found no evidence of any terrorist link.
http://www.wnbc.com/news/3331414/detail.html
Were they supposed to leave a calling card? Just unbelievable.
I remember that! In NYC, yes.