A good resource for searching TV shows for instances of various kinds of words/phrases is here: http://video.google.com/. I hope it will be of some use to M/R activists.
BTW, I forgot to mention in the orignal post, but you have to set your locale (ie, it won't return results for ALL TV shows aired all over the US). To do this click the "Preferences" link at http://video.google.com/ and then set your ZIP code. Then go back to http://video.google.com/ and do the search. Have fun!
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