Improv Everywhere tonight

Remember last year when those crazy pranksters flooded the Brooklyn Bridge and created a wave of camera flashes from the Brooklyn side to the Manhattan side?

That stunt was organized by Improv Everywhere (also responsible for the frozen Grand Central, the Food Court Musical, and the MP3 Experiment on Roosevelt Island this past May), and tonight, the creators celebrate the launch of their new book, "Causing a Scene: Extraordinary Pranks in Ordinary Places with Improv Everywhere."

From 7 to 9 p.m., there will be a video projection and book signing with Charlie Todd and Alex Scordelis, who will also dish on their experiences since forming eight years ago. And this time, you'll be in on the fun.

Powerhouse Arena is located in DUMBO at 37 Main Street. To RSVP, e-mail rsvp@powerHouseArena.com.