This happened to me a few years ago before I knew about SO, but I'm still curious. When I was still learning the basics of PHP, I accidentally typed \[code\]$i = $i++;\[/code\] When I tested the webpage in the browser, The server crashed and it took a long time to get it back up. I've typed in some pretty stupid things before and created a bunch of infinite loops, but for some reason, that was the worst. Does anyone know why this line was so 'poisonous'