This clip comes from Monty Python and the Holy Grail, the 1975 comedy film by Monty Python. The joke is remembered for its intentionally feeble cheer after the narrator declares that there was much rejoicing. Online, that contrast made it a durable reaction sound for sarcastic celebration, especially in meme edits, gaming clips, and posts where a result is technically positive but not very impressive. Its staying power comes from how quickly it communicates both success and disappointment at the same time.