How Do I Know?

How Do I Know I'm Here is a chronicle of Big Bird's brief existential crisis. Bird cannot see his shadow on the ground so does not know that he's not over there or lost where he can't be found. The rest of the gang (Gordon, Bob, Susan) explain to Big Bird different ways that he can be sure that he's really there. He isn't convinced until Susan explains that with so many people there telling Big Bird that they love him then Big Bird MUST be there.