The phrase fallait pas le faire is everyday French for you should not have done that, and as a standalone clip it has no single documented film, show or creator behind it. Instead it circulates on soundboards and in short-form video as a ready-made scolding reaction, where its meaning is carried as much by tone as by translation. French-speaking creators use it for fails, regrettable choices and pranks that go wrong, and its brevity makes it easy to drop into edits, streams and chats without breaking the pace.