Google and How All This Shit Works

I'm at home in the Bay Area. A couple of hours ago I checked movie times via Google (who's movie time function I really like). I type in a movie and it pops up all the nearest movie theater locations.

I just hopped back on the computer to double check the time and my email. I checked email first and then back to Google movie times. Except this time it popped up Santa Monica movie times.

So...why did Google do this? Not because of my IP address, which is in Tiburon, but because it knew something about my Gmail home base - Santa Monica. How did it know this? I don't know. But it certainly wasn't random.