Personally, I enjoy doing things like [lake tahoe]:
Sure, you see a spike in the winter-time (in purple), but check out the increase of searches in the summer (in green). I guess people want to go up and bike and relax during the summer too. And it’s fun to see the unexpected periodicity of some queries like [ncaa] (March Madness rules), [prom], [jewelry] (Christmas), or [burning man, sundance, sxsw].
What are your favorite graphs or insights so far?