Exactly 10 years ago on Monday, the world woke up to learn that two more unhinged American teenage misfits had snapped after years of bullying at the hands of the "jocks", the sporting overlords of their universe, and gone on a murderous rampage with semi-automatic weapons through their suburban high school.
Or that's the version we were told, anyway.
The teenagers were called Eric Harris and Dylan Klebold, and their school was Columbine High, an idyllic sounding place nestled between the Denver metropolitan area and the foothills of the Rocky Mountains. What is indisputable is that Columbine quickly became a byword for the nightmarish phenomenon - now seemingly a worldwide contagion - of school shootings. It was the bloodiest, creepiest, most vivid school attack anyone at the time could remember and remains, to this day, the episode the American popular imagination just can't seem to shake.