In the audio titled "Unusual Hiccup", a female voice can be heard, evidently human. She is experiencing a bout of hiccups. The hiccups are not your run-of-the-mill kind, they are peculiarly distinctive. They don't follow the typical hiccup pattern, instead, they have an unusual rhythm and possibly a unique sound to them. The female voice tries to speak amidst the hiccups, leading to an interesting interplay of normal speech and hiccup interruptions. The audio focuses on this unusual hiccup pattern, making it a fascinating listen.