Question: Today, for the second time in the last week or so, I've had a windfall of upvotes -- upwards of a dozen at a time. Each time all the votes have been within a few minutes of each other, which leads me to believe the same person is upvoting a bunch of my answers in the same session. Maybe I'm just looking a gift horse in the mouth and someone liked one of my answers enough to go through and upvote many others, but it seems a little fishy. Is anyone else seeing this kind of thing?

Answer: 
I wasn't responsible today, but I did spend a couple days a week or two ago trying to find interesting questions and answers to max out my votes for the day. Mostly in response to [this](https://diy.meta.stackexchange.com/questions/176/chat-room-doesnt-exist) and [this](https://meta.stackexchange.com/questions/68079/please-do-not-close-gis-se) and [this](http://blog.stackoverflow.com/2010/10/vote-early-vote-often/). You often have excellent answers, so if anyone else was doing the same I wouldn't be surprised if you were bumped.
I checked your upvotes and I do not see anything suspicious; just a bunch of votes from known users. We did have another user report the same thing but I searched and could not find anything suspicious at that time either.

I know my usage of this site is similar to @Steve Jackson's. I come in and read through new questions and vote up the good answers and questions in one session. So that type of usage (and I bet that is a similar pattern for others) could explain why you got a bunch of upvotes all at once.