I was walking down the street downtown, near the courthouse, and there was a field of grass with giant bees swarming it. There wasn't a flower in sight, so I don't know what the draw is, but they were hundreds of them. You may have to view the video full screen to see them, and even then you can't see how many there really were. It was creepy ... like something from a horror movie.
(Note: You will need flash to view the video, which rules out iPads and iPhones. Not sure why those devices won't run Flash, because Apple desktop and laptops will run it. All I can surmise is that Steve Jobs had a vendetta against someone on the Flash development team!)