The sound comes from Nintendo's Pikmin game series, where Pikmin are small plantlike creatures that can be lost to enemies, hazards and accidents. Online, the death cry spread beyond the games because it communicates a funny kind of miniature tragedy in barely over a second. Creators use it in gaming montages, meme edits and reaction clips whenever something weak, adorable or unlucky gets taken out immediately. Its staying power comes from that mix of cuteness, speed and instant emotional clarity.