Inception star Joseph Gordon-Levitt stopped by the Rolling Stone offices yesterday to tell Peter Travers about his cynical teenage years ("When I looked like a little girl — so all you little girl cynics, grow up"), his open collaborative production company hitRECord.org and why it pays to be an optimist ("We might not all be doomed!"). Plus, find out how Inception gave him the courage to climb the walls on Saturday Night Live and watch him strum and sing along to his own original song.