Some of their events have hundreds of people freezing or going in slow motion at the exact same time. Others have people riding subways with no pants. There is one where a simple Little League game turned into a near World Series experience as dozens of cheering "fans" showed up for each team. Concessioners passed out popcorn, programs with full rosters were handed out, professional videotaping came into play and a truck with a jumbotron came to display two live broadcasters for the game. Did I mention the mascots, the blimp, and that neither the teams nor the parents knew it was coming? Ridiculous!
I found myself completely in raptures while perusing their website. There are lots of videos and each are ridiculous. Their most recent venture involved "invisible dog leashes" and more than 2,000 people walked around this small portion of their city for an hour with leashes attached to no dog... The videos with large masses of people are my favorites. The ruckus that this must cause has to be nothing short of amazing, as so many bystanders watch hoards of other people do something so unexpected at the same time. It's crazy, it's silly, it's awkward and I love it!
That being said, here's a video of "Invisible Dogs":