The early 2010s witnessed two enigmatic internet mysteries: the Twitter profile Horse_eBooks, and the Youtube channel Pronunciation Book. Over the following years, these two gradually became stranger, eventually coalescing into a reveal which was more bizarre than any could have anticipated.

Patreon:   / atrocityguide  
Twitter:   / atrocityguide  
Subreddit:   / atrocityguide  

Orbis Obscura:   / orbisobscura  

Sources:

@Horse_ebooks:   / horse_ebooks  
Horseebooks website: https://web.archive.org/web/201002091...
The Atlantic writeup: https://www.theatlantic.com/technolog...
Vulture writeup: https://www.vulture.com/2012/01/theb...
Webcomics: https://horseecomics.tumblr.com/Pronu... Book YouTube:    / @pronunciationbook  
r/TheDays:   / 77days  
Battlestar Galactica Reboot Theory: https://www.dailydot.com/parsec/fando...
Bungie Theory: https://www.themarysue.com/pronunciat...
Bear Sterns Bravo: http://www.bearstearnsbravo.com/
Comprehensive Wiki: https://77days.fandom.com/wiki/Pronun...
Susan Orlean article: https://www.newyorker.com/magazine/20...
Polygon article over BSB: https://www.polygon.com/2013/9/24/476... Mary Sue article: https://www.themarysue.com/bravospam/
This is My Milwaukee:    • This Is My Milwaukee  
Alan Tutorial:    / alantutorial  

Music:

Comfortable Mystery 1 Film Noire by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty...
Artist: http://incompetech.com/

Lightless Dawn by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty...
Artist: http://incompetech.com/

Clean Soul Calming by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty...
Artist: http://incompetech.com/

Invariance by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty...
Artist: http://incompetech.com/

“Night Music” by Kevin MacLeod