This effect comes from the Super Mario game series and is most associated with the Super Mushroom power-up that makes Mario grow. It became widely recognized through decades of platform games, fan videos and gaming memes, where creators use it as shorthand for an instant upgrade. Online, it often appears in edits about leveling up, gaining confidence or turning a bad situation around. It is still popular because the short cue is clear, nostalgic and easy to recognize even outside gameplay. Mentioned alongside mario in many fan uploads.