I thought this (not)game sounded pretty interesting (and rather disturbing):
http://emshort.wordpress.com/2011/03/20/if-demo-fair-what-if-im-the-bad-guy/The effect is pretty disturbing. Progressing through the piece required, or seemed to require, typing racial epithets to refer to characters and commanding actions that I found extremely problematic. In this sense, the use of text and the parser intensified and clarified problems that a shooter game (like the one shown underlying the text) allows the player to ignore. The subjectivity of the descriptions forces the player to engage with the mindset behind violence, not merely with the tactical challenges.