Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
In what circumstances could a black swan be a metaphor

### Input:
No input

### Response:
The term "black swan" is often used as a metaphor to describe an event or occurrence that is highly improbable, yet has a massive and unexpected impact. It is used to remind us that such events, while rare, can and do occur and should be prepared for, even if that likelihood appears slim.