That said, let me address the two misconceptions I kept hearing when I was young. First, there are situations in which a weapon is justified against a barehanded attack. If an Oakland Raider defensive tackle starts beating my grandmother, I think she’d be perfectly within the law if she defends herself with a kitchen knife. Second, while keeping your knife hidden until the last possible second can be the action of a cowardly murderer, it is also sound strategy for the law-abiding citizen who carries a knife for self-protection. I mean, why tell potential attackers that you’re armed in advance? That gives them the advantage.