What is deviance? Deviance is behavior that recognized as violating expected rules and norms.For example, in the United States, being late for class is a deviant act: the same is true of wearing jeans to a formal wedding. But why do people violate norms? May be people doing that for fun, some people even don't know the acting they did is a deviant behavior. For many people,the word deviance is used only in relation to moral or political norms. The deviant is seen as someone whose behavior totally different from normal standards.
Zach Weber and Josh Rehak are college students. One day, they put a box on their face as a mask, and then they went and playing around in a crowded supermarket. They said "we just try to do something that is extremely special, and it is funny!" Obviously, what Zach and Josh did is a deviant behavior. However, the purpose they violated the norm was for fun.
According to functionalists, deviance is a common part of human existence, with ether positive or negative consequences in society. I think deviance helps to define the limits of proper behavior. Children who see one parent scold the other for climbing at the dinner table learn about approved conduct. The same is true of the cashier who is fired for yelling at a customer.
In conclusion it is a true that we can find lots of people that act in deviance, and the deviant behavior could cause a positive or negative consequence. Sometimes people acting deviant with no reason, but deviance behavior still deeply affect our social life. So sociologists and students should pay attention on learning and studying deviance.