Waltzing in the Aisles?

What is YouTube for? Thanks to PianoStreet I find this video of a Chopin Waltz I can't imagine the context with the guy in a surplice, but there's worse: Etude Op 25 No 12 the piano sounds throughly prepared a la John Cage, I suppose the hands go up and down appropriately but I'm not sure about many of the notes!