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The Lexicon has been around for quite a while now, but while playing with it today I noticed an interesting occurence, which you can see in the image below. Terms like "happy birthday," obviously, are mentioned pretty much all the time, while "Obama" has had a huge spike during the presidential elections and the subsequent victory of Barack Obama.
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However, the term "sex" has an unexplainable spike on Friday, May 30th of 2008. Perhaps it's just a glitch, or maybe I'm missing something obvious, but I can't for the life of me remember why people would mention this word more on that particular day than any other day.