My 5-year-old has set up a selection of large rocks on the railing of my back porch, which my kitchen faces.
In the kitchen, there is a small TV with a red status LED, which due to the window construction reflects twice.
As I naively walked into my kitchen, the only person in my house awake in the early morning, the rocks and lights lined up in an alarming way. I got quite a start.
(I know the picture isn't great quality ... I think the phone camera didn't want to focus on reflections. Also I zoomed in to hide my kitchen clutter.)
edit: Clarifications.
No surprise, I just made it up as just a moniker for a creature hitherto unbeknownst to mankind.
Did you make it up, or is it an ancient creature that reached across the ages and placed the idea in your head?
It was probably the Argle. The circle is complete.