Apparently fish can recognize human faces. I have, in fact, observed this myself. I've had angelfish that I trained for hand feeding. They learned that while I would feed them, other people would not. They'd come to the upper front of the tank for any footsteps, but if it wasn't me, would look around and soon leave. But if it was me, they'd start mooching at the top of the water for food.
Great. Now everyone with poor or nonexistent face recognition can feel inferior to fish.