When we talk about unpredictable nature. One of the things that should come to our mind is human behavior.
Why?
Let's just assess our surroundings. We will talk about living things, animals and plants. When we study them, it becomes obvious to us that they follow certain behavior. They have predictable outcome to the action we do to them. But, that does not mean that they all behave the same. It is just predictable depending on the type of the living matter that is living. That is considered scientific knowledge.
However, when we are speaking about human behavior. It is so much different than any other. I think you can come up with a lot of examples. But, when we talk about human behavior, we have to refer to psychology. While that is considered knowledge. But, it is not a correct kind of knowledge.
What does that even mean?
Well, let's assume that a hundred people have been put in one situation. All of them have the same situation. All of them suffered from stressed and that had a negative effect on them from within.
We may notice that not all of the group have responded the same, not all of them have felt the same level of stress and everyone is going to undergo a different psychological treatment if a therapist were to assess each one individually!
In conclusion and as a summary to what was mentioned, we can say that humans are probably the perfect example of un-predicted behavior. For one to assess the response of an individual, he might require an understanding of the culture that he was living in and his own personal take on what surrounds him. Other living beings, can be predictable at a lot of times. Because, their actions are driven by their instincts.