The Moomin Holding Knife meme features the beloved character Moomintroll from Tove Jansson's classic series, subverting his typically peaceful and wholesome nature. The image typically depicts a 1990s anime-style Moomin clutching a sharp kitchen knife with a determined or blank stare. It gained viral popularity on platforms like Tumblr and Twitter as a reaction image used to express silent rage, a 'peace was never an option' attitude, or a playful threat. Its humor stems from the stark juxtaposition between the soft, nostalgic aesthetic of Moominvalley and the sudden presence of a weapon, making it a favorite for ironic and relatable humor.