His documentary "Bowling for Columbine", released in 2002, probes the culture of guns and violence in the United States, taking as a starting point the Columbine High School massacre of 1999. "Bowling for Columbine" won the Anniversary Prize at the 2002 Cannes Film Festival and France's César Award as the Best Foreign Film. In the United States, it won the 2002 Academy Award for Documentary Feature. It also enjoyed great commercial and critical success for a film of its type, and has since gone on to be considered one of the greatest documentary films of all-time. At the time of "Columbine"s release, it was the highest-grossing mainstream-released documentary (a record now held by Moore's "&lt;a href="Fahrenheit%209/11"&gt;Fahrenheit 9/11&lt;/a&gt;").