The clip comes from Corneil and Bernie, the early 2000s animated comedy known in English as Watch My Chops, about a highly intelligent talking dog who hides his secret from most humans. Short reaction sounds from the series later circulated on soundboards as standalone cartoon effects. This heartbeat became a reusable shorthand for anxiety and infatuation because cartoon sound design exaggerates emotion so clearly. Editors still reach for it when a character's feelings need to be heard rather than explained in dialogue.