You have the right to be skeptical of a falafel sandwich from so free-wheeling an establishment as WTFExp, which also offers burgers, fish and chips, Philly cheesesteaks, and sushi. Which means you'll be pleasantly surprised to find that the spiced balls of ground chickpeas at this no-frills, down-to-earth zone are perfectly browned and lightly crisp, with just the right hint of caraway seed, balanced by a drizzle of white sauce and nestled among strips of iceberg lettuce, tomatoes, and onions. The bread is not the kind of pita that, being rough along the underside, quickly absorbs sauces or liquids and immediately becomes mushy. Rather, it is a thinner and stretchier version of naan, which keeps the sauce in and around the falafel and vegetables, and has a sturdy, structured feel to it. The portions are beyond generous, especially given the $5 price tag. Meanwhile, WTFExp lives up to its name. Unlike other falafel venues in the area, it whips up this classic Mediterranean sandwich in five minutes, making it one of the best bangs for your falafel buck close to downtown.