"We received a letter from Poland containing a really weird CD. Written on the disc is what looks like a product key, however upon examining the contents of the CD it’s quite clear that this is a puzzle of some sort. The CD contains a video of this creepy looking dude in what appears to be an abandoned building doing...stuff. There are tons of clues in his actions, for one he seems to be blinking in morse code (or something similar, possibly binary) with a light in his hand. There are also symbols popping in and out around him."
Redditors within the thread are as baffled as the original poster, though the details they uncover only strengthen the mystery of the video.