The labs people at Google do a pretty cool job of coming up with new and interesting tools they can use to analyze their ridiculous amount of data.
One of those cool tools that's been around for a while is the Trends tool, which allows you to put in any term and see how it's fluctuated in terms of its google frequency, that is, how often people are googling it.
For example, the link below shows how the peaks and valleys over time (ok, so it's just one peak and lots of nothing) around a certain Family Guy joke.
Google Trends: kebert xela
Major spike right around June 2007...but that's probably pure coincidence right???