AKA: M&W Laundromat: http://www.yelp.com/biz/m-and-w-laundromat-brooklyn
With all due respect to Cafecito Bogotá and The Habitat, Corner Frenzy has the best empanadas in Greenpoint. They're made fresh daily and come with a little cup of bomb salsa for $1.25 each. The make a bunch of different kinds but the selection dwindles pretty fast and they're usually sold out by around 7:30 p.m. I like the beef ones best, but the cheese ones are pretty good, too.
Oh yeah, and it's a laundromat. Their drop-off prices are the best I've found in the area, they're reliable and they're open late. Like Daniel K. said, when I explain Corner Frenzy to people, their response is inevitably "only in New York."
If you're skeptical about buying a hot dinner at the laundromat, I understand your concern. But the food's good and I've been enjoying the empanadas there ever since I got the courage to try it.
They sell all kinds of random beverages there as well, plus a staggering variety of soft serve ice cream. Again, this is foremost a laundromat, so how this makes any kind of sense is beyond me.
The employees range from surly to incredibly warm and friendly, especially if you're a loyal customer. I'm docking them a star for the occasional oddity with the laundry (new, mysterious stains, for example) and a miserable, multi-day experience trying to get some suits dry cleaned (one that I expect I could have avoided or at least understood if I spoke any Spanish).
Also, it's called Corner Frenzy, which is pretty awesome both for attempting to explain the madness that this business is, and for failing to explain at all that it's a place to do laundry and/or eat ice cream.
Fun fact: Mysteriously, the last two times I dropped off clothes there, the socks were packed in a branded tote bag instead of the usual recycled plastic grocery bag. The first time it featured a zany CORNER FRENZY logo and said "Have a Sweet treat & get your clothes clean." The most recent time, the tote was more somber and only said "M&W Laundromat." Both included the tag-line "The Best Service * The Best Prices * The Best Flavor" read more