Columbine

At Columbine High, Harris and Klebold were active in school play productions, operated video productions and became computer assistants maintaining the school's computer server.[5]

According to early accounts of the shooting, Harris and Klebold were very unpopular students and targets of bullying. While sources do support accounts of bullying directed toward the pair,[12][13][14] accounts of them being outcasts have been reported to be false.[15][16]

Harris and Klebold were initially reported to be members of a group that called themselves the "Trenchcoat Mafia", although in fact they had no particular connection with the group, and did not appear in a group photo of the Trenchcoat Mafia in the 1998 Columbine yearbook.[17][18] Harris's father stated that his son was "a member of what they call the Trenchcoat Mafia" in a 911 call he made on April 20, 1999.[19] Klebold attended the high school prom three days before the shootings with a classmate named Robyn Anderson.[4]

Harris and Klebold linked their personal computers on a network and both played many games over the Internet. Harris created a set of levels for the game Doom, which later became known as the 'Harris levels'. Harris had a web presence under the handle "REB" (short for Rebel, a nod to the nickname of Columbine's sports teams) and other cyber aliases, including "Rebldomakr", "Rebdoomer", and "Rebdomine", while Klebold went by the names "VoDKa" and "VoDkA". Harris had various websites that hosted Doom and Quake files, as well as team information for those he gamed with online. The sites openly espoused hatred for the people of their neighborhood and the world in general. When the pair began experimenting with pipe bombs, they posted results of the explosions on the websites. The website was shut down by America Online after the shootings and was preserved for the FBI.[20]