What happens when a White House staffer gets a photo snapped with a yellow sticky note showing the cellphone number of the Secretary of Defense, retired Marine Gen. James Mattis? First, everyone freaks out, understandably. Then, people start calling that phone number — and if you’re an enterprising journalist like Terry Fischer, a sophomore at Mercer Island High School, you manage to turn the administration’s PR blunder into an excellent interview with the military’s top dog.