Have you seen this? It's the one where the SUV is driving on the edge of balconies, curbs, and other ledges with only two of its wheels. It's silly, has a decent soundtrack, and is a pretty good use of CGI. Notice, though, the caption at the botom. It doesn't have the usual "Professional Driver. Closed Course. Do Not Attempt" disclaimer. It actually says, and I quote:
Yes, this is a fantasy. Vehicles can't really drive on buildings.
Wow. Do they really need to tell people that? Probably because there's someone out there who would actually try it. It reminds me of a joke about a guy in Greenland who sued a medicated ointment company for his severe frostbite because he read on the label that it was for "external use only." (I just brought down the credibility of this site, didn't I?)