You're making toast in the morning as per you "Normal routine", only this time, it burns. Maybe you're distracted, or you set your toaster on the wrong setting. Whatever the reason, the charred piece of bread is unsalvageable and so, you're forced to throw it out and make another batch.

The whole process has added five minutes to your morning routine, so although it's an objectively small inconvenience, you're now running a bit late leaving the house, and therefore, arriving at work. You're annoyed. But you jump in your car and head to work. But on the way, you see a car accident, and when you hear the details of the crash, you realize that had you left your house on time, it could have been you. That burnt toast — it might have saved your life.