Brave Sir Robin comes from Monty Python and the Holy Grail, released in 1975, where Sir Robin, played by Eric Idle, is followed by minstrels who sing about his bravery. The joke builds as the song details all the gruesome fates he avoids by running away, undermining the heroic image. Clips of the song spread through fan edits, forums and meme videos, and it remains popular because it perfectly captures cheerful cowardice in almost any embarrassing retreat or failed attempt at bravery.