We are still heartbroken over the passing of pop culture icon Paul Reubens. Some of his famous friends shared their touching tributes online, including Cassandra Peterson, aka Elvira, Mistress of the Dark. "Goodbye to my dear longtime friend, Paul Reubens," Peterson wrote on Instagram. "I am crushed. The world has lost one of the funniest human beings who ever lived." Remembered for playing Pee-Wee Herman, among other hilarious roles, Reubens’s legacy will live on forever. #RIP #PaulReubens #Elivra