Spend a little time with Tony Arnold, and you’ll pick up on three things: He digs Bruce Springsteen. He has a taste for lively, off-beat art. And he loves to laugh. That sense of humor, fueled by his signature dry wit, helped him tell close friends that he’d been diagnosed with Stage IV throat cancer, and it sustained him and his family through weeks of treatment. Now, thanks to outstanding care, he has a clean bill of health — and a lifetime of laughter ahead.