Aside from being a millionaire and a brilliant inventor, one of Batman's distinguishing characteristics is that he never kills his adversaries. It's a noble strategy, but it's not entirely accurate, especially in the character's early days. Since his first appearance in Detective Comics #27, the Caped Crusader has willingly thrown a crook into a vat of acid, boasting, "A fitting end for his kind." A few issues later, in Detective Comics #30, Batman kicks a villain's neck so hard that it snaps. The no-killing rule would eventually take shape as the comics became more kid-friendly, but even in the twenty-first century, the character's film appearances frequently involv