Knock, knock? It's been a while since I've done that joke, right? It's time for another Who's There? on the first day of our Big Fall Tour. (See you tonight in Brooklyn, ya'll!) First, you (yes, YOU) get down to the bottom of why John Stamos was at that random Nina Dobrev-hosted lake party. Then, last night's telethon. Did you watch it? Lindsey did. Plus, what it feels like to wake up after surgery and realize that Eric & Jessie: Game On is the only show left on TV. And do Stephen Dorf and Elle Fanning keep in touch?