What is the context in which the word unpredictable is most commonly used?

The word "unpredictable" is most commonly used in the following contexts:

• Predicting the future
• Describing a person or situation that is not easily understood or controlled
• Describing an event or situation that is not likely to occur
• Describing a system or process that is not able to be predicted or controlled

What is the context in which the word "unpredictable" is most commonly used?