Steam punk fun fair
Recently, Antigua i Barbuda--a group of Catalan artists--displayed a surreal, junk yard version of an amusement park in the Plaza Mayor of Madrid.
The last one was hard to render in a still photograph. It was a shooting gallery in which kids had to eat an olive, then load the pit into a compressed air pistol and shoot at a moving chain of bells. Behind the chain was the guts of a piano, which sounded for every miss. You had to be there, I think, though video could have worked.
It was all fairly insane, but I don't think I've ever seen so many people smiling at once in the Plaza Mayor.