Boston-based Concepts—founded in 1996—first began really appealing to sneakerheads’ sense of humor when it introduced its inaugural Nike SB Dunk, the Lobster, in 2008. Since then, the retailer has built a bit of a reputation for its Dunk releases, employing audacious packaging and leaning on tongue-in-cheek designs—including three ugly Christmas sweater shoes—to sell some not-so-serious…