The 'Letter to Murderous Santa' meme typically features a multi-panel comic or image sequence where a child writes a wish or an opinion to Santa Claus, only for the jolly old man to react with homicidal intent. Drawing on the trope of 'Santa knows if you've been bad or good,' this meme subverts the wholesome holiday figure into a dark, vengeful character. It often highlights controversial opinions or impossible requests, leading Santa to conclude that elimination is the only solution. It gained popularity on social media platforms like Reddit and Twitter as a way to express strong disagreement with specific trends or statements using a touch of dark comedy.