Flashing Light - Various Lessons - 6 WPM - "Black" & "Sekelick"

Man, I tell you, when I first found this I had NO IDEA what it was. After going through it a couple times I'm only kinda-sorta sure that it's probably part of some sort of series of lessons about Morse code for sailors. Black and Sekelick are probably the ones who made and/or taught the course.
But let me tell you, first time I watched this video, it kinda freaked me out. Like... am I cursed now?