Odd story I just came across about a Microsoft "Santa" bot that spit out some responses they hadn't planned on...well ok, the news media can buy that story but somewhere a developer had planned this response and IMHO it should have been caught by a code review and handled differently for such a huge public project which you just *know* is going to be scrutinized by everyone wanting to make Microsoft look bad.
See the full story here:
http://www.citynews.ca/news/news_17427.aspx
EDIT: further link - more here: http://www.theregister.co.uk/2007/12/03/santa_filth_outrage/