The Special Editions of Star Wars IV-VI
There was absolutely nothing wrong with the versions I grew up with on VHS, but no, Lucas had to add in extra stuff that makes no sense, such as replacing puppets with CGI, adding in details, and making Greedo shoot first.
Not to mention the absolute travesty of Return of the Jedi. You know what I mean; making Anakin’s wounds less severe when he’s unmasked, then taking away Sebastian Shaw and adding in Hayden Christensen for the final force ghost scene.