Rube Goldberg Machine Featured in OK Go Music Video

My favorite part of the video is that you can see the detritus of previous dry runs, as illustrated in this photo. 

OK Go requested a Rube Goldberg machine as the centerpiece of a video. To borrow from wikipedia, a "Rube Goldberg machine is a deliberately over-engineered machine that performs a very simple task in a very complex fashion, usually including a chain reaction. The name is drawn from American cartoonist and inventor Rube Goldberg." Think of the classic board game Mousetrap or your favorite chain reactions from Tom & Jerry cartoons.

More than 40 engineers, techies, artists, and circus types spent several months designing, building, rebuilding, and re-setting a machine that took up two floors of a Los Angeles warehouse. The volunteers gave up many nights, weekends, and even some vacation days to build a stunning machine that has drawn more than 13 million views on YouTube.

Source: What on Earth (a NASA blog)
Related: Brent Bushnell (I swiped the photo from him)