[sdfjkl]

I think this might be a viral advert for the next Back To The Future movie. A film studio would have access to special effects, the car, the actors and celebrities and the financial backing for such an elaborate fake.

[codezero]

The effects weren't even that elaborate, they all look like they are on a wire.

[xauronx]

Yep, you could even see their shirts move when the harness takes their weight.

Also, as soon as they "hover" they're suddenly putting no weight on their legs. Unless hovering implies complete gravity reversal, that doesn't make sense. They'd still be putting all their weight on the board.

Ok, for an obvious fake, I care too much :)

[mistercow]

That and it mimics a similar prank that Zemeckis back when BttF 2 came out.