Enjoy the ride :) You may have hit the google lottery!
We launched our music start-up(now dead) and it was getting few k uniques/day. Then overnight we start seeing thousands of visitors from Thailand. And each day--literally--the number would increase by a few grand. Turns out YouTube was blocked in Thailand and we were getting a good chunk of YouTube's traffic from Google. Eventually YouTube was unblocked(six mos later) and our traffic flat-lined.
It used to be like 2 or 3 pages down below a bunch of content farms, very glad about this.
Edit: Actually, now I'm number 4 for philadelphia and number 1 for Philly, still pretty happy though.