Existential Sesame Street characters. Is it even possible? In a 1996 episode of Sesame Street’s Monsterpiece Theater, Telly and Grover wait for Elmo to turn up. ‘What if we wait here all day and he never shows up?’, Telly asks. Because it’s Sesame Street, the tree next to them comes to life and walks away. And the entire segment ends a minute and a half later. Nobody waits that long these days. Nobody waits that long on TV.