A more thorough explanation:

Definition: Casus insolitus (kay-suh-s in-sol-uh-tuhs) is a Latin term that refers to an unusual circumstance or event.

Examples:

• A man surviving a fall from a 20-story building without any serious injuries is a casus insolitus.
• A cat giving birth to a litter of puppies is a casus insolitus.
• A tree growing upside down is a casus insolitus.

These examples illustrate how casus insolitus refers to events or circumstances that are unexpected or unusual. They are not common occurrences and often defy explanation or reason.