Filmmaker, author, and political activist Michael Moore trains his satirical eye on America’s obsession with guns and violence in his third feature-length documentary, which gets its title from a pair of loosely related incidents. On April 20, 1999, shortly before they began their infamous killing spree at Columbine High School in Littleton, CO, Eric Harris and Dylan Klebold attended their favorite class, a no-credit bowling course held at a bowling alley near the school, the same bowling alley which would become the scene of a robbery and triple homicide two years later.