 Nyorai kupfuurira kweiyi ndima - Muna April 1999, rutyo rwezvinobudisa nhau namapoka anotarira masimba masimba rwakabvumirwa mumeso avo sezvo nzvero dzoupenyu hwaEric Harris naDylan Klebold, vapfura muColumbine High School massacre, vakazivisa kuti vakanga vari vateveri vemutambo wevhidhiyo, Kutongwa, uye vakanga vatogadzira mazinga ayo nhasi anonzi mazinga aHarris. Kukurukurirana kukuru kwechisimba mumitambo yemavhidhiyo kwakatevera chiitiko ichi nekukakavadzana kwakasimba kwakaitwa kumativi ose, uye kutsvakurudza kwechiitiko icho chakanga chatanga mukati me1980s chakagamuchira rutsigiro rutsva uye kufarira. 