Finding humor in a chemical attack? Julia Stiles on her new dark comedy 'It's a Disaster'

Imagine: You're at Sunday brunch, and the world is about to end. That's basically the premise of a new movie "It's a Disaster."

It's a dark comedy starring Julia Stiles and David Cross, who portray a group of 30-something friends at an obligatory couples brunch. As you can imagine, awkward moments abound.

The couples eventually learn they are in the middle of a chemical attack. The movie opens in theaters on April 12 and Julia Stiles joins Soledad O'Brien on "Starting Point" to talk about the dark but hilarious movie.