The cuckoo clock has been a household curiosity since traditional wooden clocks from Germany's Black Forest region became popular in the eighteenth and nineteenth centuries, with a small mechanical bird popping out to announce the hour. The two-note call imitates the common cuckoo, a bird whose distinctive song made it easy to recognise even without seeing it. Online, that same call has become a handy shorthand for passing time, old-fashioned homes, and gentle comedy, appearing in cartoons, short videos, and meme edits whenever a creator wants an instant, familiar time cue.