Hitting someone, throwing a ball hard at someone's head, spitting at someone: these are all examples of harmful acts, called 'battery' in Tort Law, and most of us judge those who do such things without the victim's implied or actual consent as morally blameworthy. Could widespread aversion towards such acts be due to some kind of fundamental moral principle? John Mikhail discusses this question with Nigel Warburton in this episode of the Philosophy Bites podcast. Philosophy Bites is made in association with the Institute of Philosophy.