It's easy to get excited about Dunkin' Donuts and the arrival of another Best Buy will at least offer us a more customer-friendly electronics shopping experience, but can Shanghai really handle the full frontal in-your-face Americana that is Dippin' Dots? For the uninitiated, Dippin Dots are little balls of liquid nitrogen-enhanced ice cream that look like smallpox, feel like Styrofoam, and taste like redneck. Fine, maybe they don't taste like a redneck (they taste like......