In days of old, when knights were bold, this particular knight was leaving the castle and called one of his squires. "Here is the key to my treasure chest. I will be gone for about a year and I want you to keep it safe until I return. Don't let anyone near my gold."
The knight sets out on the dusty road, armored from head to toe, and takes a look back at his castle. He sees the squire rushing across the drawbridge, yelling, "Stop! Thank goodness I was able to catch you. This is the wrong key."