In high school, I played in a pit band for "Grease," and the high-strung gay man at the podium would often roll his eyes. "Every day at school I watch ya / Always will until I gotcha....My God, this writer was a real Sondheim....." Well, no. But "Grease" is more than just fun. Sometimes, it's really smart. Sandy recalls, "It got colder....That's when [love] ends...." Cut to Danny, with his own clan: "And I told her....we'd still be friends...." And who can forget Billy Porter, giving tough advice to his protege? "Beauty School Dropout....You think you're such a looker. But no customer would go to you...unless she was a hooker...." ( And I know you're not a hooker...Sit up..... ) My favorite moment in "Grease" is "Those Magic Changes," which makes clear that adolescent heartache is narrative gold. Without teen angst, we wouldn't have "Pride and Prejudice" or "Romeo an...