There are times in life where we get angry, and there is no exception. Unless you are a human totally devoid of all emotion, then all humans in life have experienced anger. The world is not a pretty place, and there will always be things we see as injustices, whether small scale or in a larger scale.
Some people just cannot control their anger, and will tend to lash out physically. While the worst ones will lash out at other living creatures, it is not unusual for an individual to lash out at an inanimate object. They later tend to regret doing so after they calm down. This mixed martial artist thought he was lashing out at the air, but hit a ring girl instead. Needless to say, he regrets it.