Jamie Costa’s repertoire is as impressive and studied as it is vast, and this year his uncanny tribute to the many characters of the late Robin Williams went viral. His Vine account is a parade of varied and well-honed impersonations, nailing with impressive vocal dexterity not just certain actors but individual characters those actors have done, so much so that you’d be able to identify most of them with your eyes closed. Among our favorites: Russell Crowe, Owen Wilson, the Joker (Jack Nicholson’s, Heath Ledger’s, and Mark Hamill’s), Shaggy and Scooby, George Bush, Steve Irwin, and Johnny Depp.