I saw this earlier today and rushed up to take a photo.
Obviously I know very little about it apart from what I can see;
1. It's on a Fiat.
2. It's a new Fiat, March 2007.
3. This is looks like a genuine van for a genuine tradesman. It has contact details.
So we can assume that it's a authentically pissed off van owner and not a TV prop or a stunt or something. It looks like a pretty effective way to take revenge. I bet Fiat hate it if he turns up at the local dealership. And it's highly visible on the road, and now thanks to me, on search engines.
I'm sure there's a name for this. Antivertising or something. But that's for other people. It made me smile, so I thought I'd share it with you.