Boating, dragon-style

On hearing loud (Dutch) voices outside on the canal, our normal response is to mutter curses and swear words and shut the windows. However, when they're accompanied by the sound of large drums, we feel compelled to take a look. And this is what we saw: 4 dragon boats being propelled up the Keizersgracht, on their way to ... well, we're not sure. They look a little unstable to head out on to the IJ, but any form of race would need a much longer, straighter stretch of water. Most odd.