Batman is known as a hero who never kills, but there was a time that he had no problem brutally dispatching of those he came up against in battle. This was back in the '30s/'40s/'50s for the most part, and the Caped Crusader would frequently hurl gangsters off rooftops, or push them into vats of acid. As if that wasn't brutal enough, he even killed a group of henchmen with a machine gun in Batman #1, declaring "Much as I hate to take human life, I'm afraid this time it's necessary!" If you need further proof about just what a tough SOB this early version of the iconic superhero was, he once kicked someone so hard he broke their neck.