Oil in your lamp

Ten young women were waiting for a bridegroom. Five had brought extra oil for their lamps, five hadn't. The bridegroom was delayed and they all fell asleep. When he finally came, the lamps of five of them were going out.

The story isn't about panic, but about being prepared. Everyone slept, the wise ones too. The difference was the oil. What you fill up when things are quiet is what you need when it really matters.