I’m sure everybody knows this particular sound effect—when something dramatic is revealed, the music goes dunh dunh DUNH, rising on the final note, often accompanied with a zoom to closeup on a character’s shocked expression, like this (or variations thereof—this actually isn’t quite the sound I have in mind).
However, it’s mostly used for exaggerated comic effect, at least nowadays. So I was wondering, is there a clearly defined origin for this? Has it always been comedic, or was it used earnestly? Can somebody point to a non-comedic usage? Or to the origin of the music in the video?