We were demonstrating our death ray to the principal.
The laser (a 3mW HeNe) was across the room mounted on a tripod.
Just as I was explaining what the whole thing was, I noticed that the dot on the wall had vanished.
I looked over at the device and noticed my principal's head was blocking the beam between the laser and
the projector. He was looking squarely into the aperture of the laser while adjusting his glasses.
I never thought he was overly bright.