The post links to a prior implementation: https://www.reddit.com/r/JustGuysBeingDudes/comments/195gqnm...
where it shown being in a FPS video game.
Top comment there is: "The Pied Sniper" (!)
That clip appears to be from https://www.twitch.tv/deanobeano/clip/CharmingDoubtfulCattle... (note: brief profanity at the end of the clip).