William Fathers of newsagent Polperro News - who captured the moment on his shop's webcam - said it did look spooky after claiming "#Aliens are beaming down to #Polperro harbour" on his Twitter feed.
"It happens at this time of year when the sun gets low in the sky.
"The light bounces off the sea and hits the camera.
"It's just one of those things but it does look weird."
