Conversation so far:
When did Neighbours' Daphne Clarke marry Des Clarke?
Daphne Clarke married Des Clarke in July 1986.
Did Neighbours' Daphne Clarke and Des Clarke stay married?
Daphne Clarke dies from a car accident which ended the marriage.

Question: What was special about their marriage?
Self-contained rewrite: What was special about Neighbours' Daphne Clarke and Des Clarke's marriage?