Michael Moore's documentary Bowling for Columbine explores the high rate of gun violence in America. He interviews people living in communities affected by mass shootings about how these events impacted their lives and why such tragedies continue. Moore uses sarcasm and shocking facts to emphasize the problem. For example, he cites a Chris Rock comedy bit about raising bullet prices and statistics showing America's gun deaths far exceed other countries. Moore's expository method of voicing facts in a sudden, informative way makes the problem's gravity clear and is an effective technique the document summarizer would employ in their own work.