We all know one or two. We don't agree with them, but they're our friends anyway, even if Anthony Bourdain likens them to terrorists, some courts have called them murderers, and Roger Clemens doesn't know what they are. They're vegans—or at least really serious vegetarians—and their numbers are growing. Are they obnoxious about it? Well yes, sometimes, like when Hugs for Puppies is out blocking the sidewalk and ruining people's meals. And while veganism......