This clip comes from Heavy, one of the main playable classes in Valve’s Team Fortress 2, released in 2007. Heavy’s voice lines became widely reused in gaming edits because his delivery is instantly recognizable even in very short clips. “How could this happen” spread through meme videos, montage parodies and reaction posts as a quick way to show disbelief after a blunder or unexpected loss. It remains popular because it is short, clear and tied to a well-known game character.