It's tough sharing 99% of the same DNA with chimps and other higher primates. Try as we might to consider ourselves the pinnacle of creation/evolution, we're actually little removed from the brute beasts we keep behind bars at zoos. After millions of year we still engage in many of the same posturing, dominance and aggressive behaviors as our primate cousins. But like it or not that's a fact of life we sometimes have to come to grips with.
Take fighting. When was the last time you got involved in a physical altercation and what prompted it? This could be anything from kicking and pulling a sibling's hair, or a bar room brawl, or a junior high school yard scrap over some perceived slight. How do you respond when it appears a situation is elevating to the point where a fight may occur? Have you ever been the one who initiated a fight? Any memorable fights you've ever witnessed in public places?