Just saw this on TV and laughed out loud.
To preface it, since I can't find a version with an English description:
For a hidden camera TV show, a guy dressed up as a painter and began painting this guy's W126 with washable paint. When the owner of the car approaches, not knowing that its a prank, the jokester continues painting the car despite being pulled away and yelled out multiple times.
Then the beat down begins:
When the painter finally gets two words out telling the W126 owner that its a prank for a TV show, the beating continues.
http://www.youtube.com/watch?v=GAhTpG47nIw