The black rain frog, Breviceps fuscus, is a small burrowing frog native to South Africa that makes a distinctive high-pitched squeak when it feels threatened. Clips of the frog squeaking while being handled circulated widely online, where viewers were surprised by how loud and cartoonish the noise sounded coming from such a round, unassuming animal. Editors soon lifted the squeak as a standalone reaction sound, and it stuck because it instantly signals panic, shock or comic distress without any words. Today it appears across short-form videos, gaming edits and meme compilations as a quick punchline for startled moments.