I'm sorry Google: I did not mean to break you
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Google gives precedence to sites that
1) Have the search terms in the website title ("serial")
2) Have the search terms in the address (sims-3-cd-key-generator.html)
3) Are recent
Which is fine when people follow the rules, but not so fine when people don't.
Some malware software writers have taken to taking over popular words by making a page that looks legit (and even has relevant text) but then instantly redirects you to another site without ever taking you to the first site. They've been known to go after top search terms on Google Trends to capitalize on up to the minute popular search terms.
For more info and examples, check out ZDNet's list of The Web's Most Dangerous Words to Search For (#1 is "screensavers" with 59.1% dangerousness with "lyrics" and "free" also being higher risk words as well)
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