3 monks

Once upon a time, there were 3 monks who lived in a remote monastery. When there was only one monk, he fetched water by himself. When two monks were present, they fetched water together. However, when all three monks were present, they each believed the other two will fetch water. As a result, they didn't have any water the next day.

When it's everyone's responsibility, quite often, it becomes nobody's responsibility.
Find something that seems to be owned by everyone but no one, own it, that's an opportunity for you to stand out as an exceptional leader.