Accident (noun)
Definition: an unfortunate incident that happens unexpectedly and unintentionally, typically resulting in damage or injury.
Example: "She had an accident at the park."
ser·en·dip·i·ty
/ˌserənˈdipədē/
noun
the occurrence and development of events by chance in a happy or beneficial way.
Who knew that an unfortunate event could lead to the creation of something so beautiful?