When are typos deadly? Nethack. :: semicomplete.com - Jordan Sissel
http://www.semicomplete.com/blog/geekery/when-a-typo-kills-you.html?source=rss20
"A typo caused the untimely demise of my latest nethack venture. I ate a cockatrice corpse, instead of wielding it, while on the astral plane, poised to completely decimate the current top score."