67 Burger (www.67burger.com, 67 Lafayette Ave, at Fulton St., Brooklyn, NY 11217, (718) 797-7150) is an amazing place. A long, narrow space around the corner from the G Train's Fulton St. station and down the block from BAM, is open until 11pm, so you can squeeze in a late dinner after a movie or show.
You can build your own burger from a long list of meats, chesses, sauces, and toppings (red wine pickled onions anyone?), or you can go with one of the burgers listed if you're feeling indecisive (Ranch, BBQ, Southwestern, etc.). This is their Basic Bacon Cheeseburger with Cheddar.
The bacon part is incredible. Little, crumbly bits of bacon are on the bottom and are perfection. They also serve the BEST, most amazing Onion Rings you'll find anywhere. Made with real onions in nice, big slices so you can bite into them and they won't fall apart.
The milkshakes are great too, bog and thick in basic flavors (vanilla, chocolate, strawberry) and two interesting ones I've yet to try (oreo and beer).
After you place your order at the counter, you'll be given a big plastic number on a stick that you set on your table so the staff knows where to bring your food. It's a sort of crazy, loud place, with frenetic energy coming from the cooks behind the counter, so it's not a romantic date night place. But the staff is sweet, and they'll even offer to cut your burger if you're sharing.