Aziraphale wasn't aware of modern technology. Crowley knew this, and he had a lot of fun with it. He raised his camera.

"What's that?" Aziraphale asked curiously.

"It measures the amount of information you're capable of retaining," Crowley lied, sounding smart. He saw Aziraphale's interest spark through the lens of the camera. "But there's this funny face you have to make for it to work…"

"Show me," Aziraphale ordered.

Crowley hung the resulting picture on the wall of his flat. It showed Aziraphale squinting one eye, raising one eyebrow, and sticking out his tongue. Crowley was very proud of himself.