The Bloodsucker is a classic mutant from GSC Game World's S.T.A.L.K.E.R.: Shadow of Chernobyl (2007), a near-invisible predator that stalks areas like the Agroprom Research Institute. Its hissing call became one of the series' most recognisable audio cues, warning players of an attack they cannot see. Fans rip and share short clips like this one on soundboards for edits and memes, where it pairs naturally with an enemy spotted cue or a sharp jumpscare scream to sell sudden danger.