show him your card

A Department of Water representative stopped at a ranch and talked with an old rancher.  He told the rancher, "I need to inspect your ranch for your water allocation."

The old rancher said, "Okay, but don't go in that field over there.."

The Water representative said, "Mister, I have the authority of the Federal Government with me.  See this card?  The card means I am allowed to go WHEREVER I WISH on any agricultural land.  No questions asked or answered.  Have I made myself clear?  Do you understand?"

The old rancher nodded politely and went about his chores.

Later, the old rancher heard loud screams and saw the Water Rep running for the fence.  Close behind was the rancher's bull.  The bull was gaining on the Water Rep with every step.

The Rep was clearly terrified - so the old rancher immediately threw down his tools, ran to the fence and shouted, "Your card!  Your card!  Show him your card!"