Hans the Brave and the Cruel Law

In a magical kingdom, there once lived a cruel king. Around his palace was a bridge, and he placed a guard on the bridge who received the following orders: he must ask everyone who crosses the bridge why they have come here. If the person answers falsely, he must be hanged, and if he answers truthfully – he must be beheaded.

One day, Hans the Brave needed to pass through this place. When the guard asked him: "Why have you come here?", Hans gave such an answer that the guard was forced to release him. What exactly did Hans say to the guard?