Back in 2008 I wrote about the Castell festival troupes in Catalonia, Spain, which compete with each other to see who can build the tallest 'human tower'.
Thanks to a link provided on an IRC chat forum this morning, I came across this video clip of a recent Castell festival in the city of Tarragona. It's one of the best I've yet seen celebrating this gymnastic art form.
The celebrations after the festival are also great fun . . . although your head might not agree, next morning!