An orthopedist's wet dream

 
YouTube link.

I should think most web-surfers are by now familiar with the annual Cooper's Hill Cheese-rolling and Wake.

In theory, competitors are aiming to catch the cheese; however, it has around a one-second head start, and can reach speeds up to 70 miles per hour (110 kilometres per hour), enough to knock over and injure a spectator. In the 2013 competition, a foam replica replaced the cheese for reasons of safety. The winner was given the prize of an actual cheese after the competition.

There are lots of basically identical videos. I like this version because of the choice of slow motion and the music.  A tip of the blogging hat to gwdMaine at Neatorama, who identified the music as the aria "Habanera" from Bizet's Carmen and offered this verse from the lyrics:

The bird you hoped to catch
Beat its wings and flew away.
Love is far, you can wait for it;
You no longer await it, there it is.
All around you, swift, swift,
It comes, goes, then it returns.
You think to hold it fast, it flees you,
You think to flee it, it holds you!