Frank looked down at his camera, and then back up at his house. He was trying to sell the place and move into something larger, but couldn't place an advert until he successfully took a photograph. So far, all he had produced was black.
Being fully focussed on the uncooperative device, he did not hear his neighbour's car arrive. The first sign that he was not alone was a friendly call of, "Hey, Frank. Need a hand?"
"Oh, hi Walter. I can't get anything but black from this camera," Frank explained.
Walter took a quick glance at the gadget. "I think I see the problem, and it's right up my alley."
"I didn't know you were into cameras," responded a surprised Frank.
"Not really, but I know enough to determine that you need to… open the iris." The technician's eyes lit up with mirth.
Frank blinked. "Are you alright?" Walter looked like he had said the funniest thing ever and was holding back a fit of giggles.
"Uh, it's, uh, classified. I'd better go." Walter fled the scene.
"If you say so. Thanks for helping," Frank replied to his neighbour's departing back.