Columbine High School massacre

The Columbine High School Massacre occurred on April 20, 1999 at Columbine High School in Jefferson County near Littleton, Colorado, United States. Two teenage students, Eric Harris and Dylan Klebold, executed a planned shooting rampage killing 12 other students and a teacher before committing suicide. It is considered to be the second worst school shooting in U.S. history, the worst being the Virginia Tech massacre.

Part of a rash of similar shootings, the events triggered a wide-ranging debate about the effect of violent entertainment, particularly the videogames Doom and Quake.

Doomworld posted an editorial defending Doom and the staffers of the time participated in a variety of press interviews. Andrew "Linguica" Stine and Matthew "Mattrim" Dixon were interviewed by SFGate.com. Javier "Dukrous" Heredia defended Doom as part of an interview by CNN.

Doom connection and the Harris levels
One of the two gunmen, Eric Harris, was an enthusiast of the Doom series, owning some of the Doom novels and having made Doom levels under the nickname "RebDoomer". These levels are referred to as the Harris levels. In a video tape recorded before the shooting, Harris expressed enthusiasm for the planned shooting, saying it would be "like fucking Doom." He also pointed out that the shotgun was "Straight out of Doom."