The tree fiddy gag comes from South Park, where the Loch Ness Monster keeps turning up in disguise to ask for three dollars and fifty cents. The joke spread far beyond the show as fans clipped the line, shared it on video platforms and turned it into a shorthand for someone asking for a small amount of money. Its staying power comes from the contrast at its heart: a supposedly terrifying creature making an ordinary, almost polite request. That contrast makes the line easy to reuse in new edits without needing any explanation.