When I walk into my dentist’s office, it’s like walking into a peaceful aquarium. Every patient’s chair has a window-size monitor in front of it where CG fish glide lazily over sun-dappled coral and miniature sunken ships. Today, however, the monitors were black, and the back hallway was dark.

“What happened to all the fish?” I asked my hygienist, Carrie.

She sighed and chose her words carefully. “Uh… Our computer guy was let go.”

“So what, he deleted the aquariums?”

“No, he reprogrammed them so the fish die and float to the top. Once an hour.”

I want to see.”