Camera

"You see. The prefix mega- means 'large.' And this camera I sold you has twelve LARGE pixels. I never lied to you!"

Watermark

"Why do you watermark every picture you upload?"

"So no one will claim my work as their own."

"But you didn't take any of these pictures! Which work?"

"What do you mean, which work? Pictures don't watermark themselves, you know."

Soul

Photographic evidence

"The usual skeptics must know that NASA itself examined this photo and certified that there's no digital manipulation."

Photography

"When you told me you took digital photos, I didn't think you meant that your finger shows up in all of them"