This meme originates from the climactic Battle of the Pelennor Fields in 'The Lord of the Rings: The Return of the King.' The Witch-king of Angmar, leader of the Nazgûl, arrogantly proclaims that 'no man' can kill him, only to be confronted by Éowyn, who reveals her identity and delivers the fatal blow. On the internet, the template is used to highlight technicalities, unexpected loopholes, or instances where a specific rule doesn't apply to the person in question. It’s a favorite for subverting expectations and celebrating 'gotcha' moments in everyday life, sports, and pop culture.