The sad hamster became a staple of short-form video after creators paired a photo of a drooping, wide-eyed hamster with slow, sorrowful violin music. The format spread quickly on TikTok and Instagram Reels because the joke needed no explanation: the hamster's expression did the emotional work, while the music made a small setback feel absurdly serious. It is still used because it fits almost any minor disappointment, from a bad grade to a rainy holiday, and the contrast between genuine-looking sadness and a trivial problem keeps the punchline fresh across new videos.