Optical Illusion
Is that Kathy still at her desk diligently working past her shift? Or is it a picture of Kathy to make it look like she’s still at her desk diligently working past her shift? This person pulled a prank on her coworkers by taping a blown up photo of the top part of her head to her computer monitor.

Hey, it worked. People bought it. We can imagine they walked into her office expecting her to be there and, lo and behold, she’s not. Perhaps some folks had full-fledged conversations with non-existent Kathy. Kathy’s a great listener, isn’t she? She never interrupts you when you’re talking. Ten points for Gryffindor!