Martha Plimpton says she learned how to act on the job. She talks with Marc about her childhood roles in movies like The Goonies, how those paved the way for her work on Broadway, and what she does to overcome crippling stage fright. Plus, Marc's friend Laurie Kilmartin stops by to talk about how she was able to take overwhelming grief and turn it into a new comedy special. This episode is sponsored by the new series SIX on History, Squarespace and Stamps.com.