Elvis Presley, the King of Rock ’n’ Roll, is one of the most famous pop culture icons of all time. Though he died in 1977, conspiracy theories abound about how he may have faked his own death. And some of his fans are so devoted they might just choose to believe them. However, should he ever make an unlikely return, he might have some explaining to do about the seedier aspects of his personality and career. Because Elvis had a darker side, and these 20 little-known secrets might make you reconsider everything you previously thought about him.