Markiplier, whose real name is Mark Fischbach, built a huge online audience with energetic playthrough videos and comedy sketches. Short clips of his reactions are widely shared on meme soundboards because his delivery is so recognizable. A letter-themed moment works well for creators because mail, messages and announcements are common video tropes. Without needing the full original context, the five-second length makes it easy to drop into edits and streams as a quick comedic beat.