Especially if you can make the "mouth" scream like a little girl. Blood gushing from a smashed nose is a good deterrent, too...One guy I spoke with worked as a bouncer. He frequently dealt with several attackers. He found that if he pops the "loud mouth", the "leader" of the group, most of the others lost heart fairly quickly. While not having to "beat" 4/5 people, effectively dealing with one often resolves the situation...