Have you read these irate Sylvester Stallone posts on Instagram? Fans of Sly and the Rocky movies might be surprised to see the star go full Italian Stallion on 93-year-old producer Irwin Winkler and MGM. “I really would like [to] have at least a little [of] WHAT’s LEFT of my RIGHTS back,” Stallone posted to his 15 million followers on July 18. And just today, reacting to the news that MGM is in early development on a Drago spinoff potentially with Dolph Lundgren, Stallone posted art of a bloodied Winkler and called him the “most hated, untalented, decrepited [sic] producer in Hollywood,” followed by “RETURN MY RIGHTS BLOODSUCKERS!”