Walking across a shopping centre car park a soldier found a distraught woman sobbing. He asked her what was the problem and she explained that she's left her keys inside the car. "Don't worry," he replied. "I can help." The woman looked on in amazement as the soldier removed his trousers, rolled them into a tight ball and rubbed them against the car door. Magically, it opened. "That's so clever," the woman gasped. "How did you do it?" "Easy," replies the man. "These are my khakis."