The Skeksis are the cruel, bird-like rulers in Jim Henson's 1982 fantasy film The Dark Crystal, creatures whose voices were designed to sound aged, scheming and unsettling. A single gasp from one of them captures that whole personality in just over a second, which is why short reaction clips from the film circulate as memes and soundboard sounds. Editors reuse it because the sound is instantly recognisable to fantasy fans, yet works even for viewers who have never seen the film, as a pure expression of shock.