The first trailer for Star Wars: The Rise of Skywalker included a surprising reveal at the end—the laugh of Emperor Palpatine (Ian McDiarmid). Palpatine was actually the Sith Lord Darth Sidious and pulled the strings in the prequel trilogy to rise to Emperor. He was thought dead at the end of Star Wars: Return of the Jedi when Darth Vader threw him down a pit on the second Death Star and then the second Death Star blew up. He might still be dead—the laugh could be from a clone or a ghost—but ScreenRant reports that it was …