This is a true story unforunately.
On thursday a girl was due to attend school. However on that day the school was closed. On that day the girl went to the park, she sat on a bench. A disaster was about to occurr, a tree banch fell struck and killed the girl.
What's the cause and what's the effect here?
What we know:
That branch was due to fall there or abouts at that exact time and sitting under it would be deadly.
Had the school not been closed the girl would have gone to school, and we can say with confidence (not 100%) she probably would have got there alive. She certainly wouldn't have been sat under the bench that day.
Now on one side the cause is the tree striking and taking her life. However if the school was open she wouldn't have gone to the park and sat there.
Now is the cause the tree branch or is what's central to these outcomes of events the school being open or closed?