What keeps you at bay from going completely insane on people?

What’s the something that keeps your sanity from going out of control? Every one (I’m hoping) Has felt this urge to just….Go INSANE on someone….Or a group or maybe just in general. When I’m near the edge but not quite, I think of my girlfriend and other friend on what they would do to keep me back…I think “God…Do I really wanna do this?” Then I start to rejuvenate and calm down a little on the inside.