I found this lovely video on The Small Object's blog, and I just had to share it.
When I was in high school, I used to live in an eighth-floor apartment that had a wonderful view of this kind of bird activity. I would sit on the balcony with my best friend and watch for ages each day. Moreover, the apartment was always swarmed with seagulls who would eat bread out of the air if you threw it. You had to be careful not to hit the not-so-understanding little old lady who lived across the street as she tried to get into her car, though.
Nowadays, I get my amazing-bird-action fix from the masses of chimney-roosting swifts here in Portland. If you're in the area, I highly recommend getting out to see this. It's a great excuse for a lovely picnic dinner, and you get to be stunned and amazed by the awesome power of nature at the same time. Win-win!