Best story ever here.
In trying to teach Watson, IBM's amazing experiment in AI to understand some of the nuances of our language, they had it memorize the Urban Dictionary. Problem- the machine started swearing.
Watson couldn't distinguish between polite language and profanity -- which the Urban Dictionary is full of. Watson picked up some bad habits from reading Wikipedia as well. In tests it even used the word "bullshit" in an answer to a researcher's query.
I like Watson more and more each time I read about him/her/it.