Is there any deep fake video that is possibly convincing that is 100% generated synthetically? All the deep fakes I've seen that don't look incredibly weird at

Is there any deep fake video that is possibly convincing that is 100% generated synthetically? All the deep fakes I've seen that don't look incredibly weird at first glance essentially re-use clips (like Back To The Future[0]) and they replacement an element, like a face, but the rest of the footage already exists. If you look closely though, particularly at the mouth of the video I linked, something isn't quite natural about it still. Same deal with this Taylor Swift fake[1] [0]: https://www.youtube.com/watch?v=8OJnkJqkyio https://www.youtube.com/watch?v=8OJnkJqkyio [1]: https://x.com/McAfee/status/1745226438641602866 https://x.com/McAfee/status/1745226438641602866