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Networking technology has radically changed how we do many things -- including startling other people. The group Improv Everywhere uses it to pull off pranks—or, as they call them, missions. Two of their best known missions are the famous annual no-pants subway ride, and the Grand Central Station freeze. Now the Improv Everywhere guys have a book: Causing a Scene: Extraordinary Pranks in Ordinary Places with Improv Everywhere. It's part a documentation of their work, part a how-to manual. Co-author Alex Scordelis joins The Takeaway to discuss the group and its methods.

Check out Improv Everywhere's "Food Court Musical":