Columbine High School massacre "Christianity is YOUR Columbine". In a self-made video recording sent to the news media by Seung-Hui Cho prior to his committing the Virginia Tech shootings, he referred to the Columbine massacre as an apparent motivation. In the recording, he wore a backwards baseball cap and referred to Harris and Klebold as "martyrs." Adam Lanza, the perpetrator of the Sandy Hook Elementary School shooting had "an obsession with mass murders, in particular the April 1999 shootings at Columbine High School in Colorado." The perpetrator of the Emsdetten school shooting praised Harris in his diary. In November 2007, Pekka-Eric Auvinen imitated Columbine
Columbine High School massacre film's acronym, NBK, as a code for the massacre. In February 1998, Klebold envisioned a massacre with a girl like in the film, writing "Soon...either ill commit suicide, or I'll get w. [redacted girl's name] & it will be NBK for us." In April 1998, Harris wrote "When I go NBK and people say things like "oh it was tragic" or "oh he is crazy!" or "It was so bloody." I think, so the fuck what you think that's a bad thing?" In Harris's yearbook Klebold wrote "the holy April morning of NBK". Around February 1999, he wrote "maybe going