A video is circulating with some dudes filling a guy's outfit with helium and having him float around, videotaping the whole thing. It's a cool effect (though pretty unbelievable) and makes for a sort of staged psychadelic Jackass fashion stunt.
I think there was an episode of MythBusters where they tested essentially the same thing and found it'd take hundreds of balloons to lift a small child. Still fun in concept though.
Yeah, I read something about this. From what I have heard, its actually viral advertising through levi. They did the same thing with the guys doing backflips into denim pants and a monkey going through a day as if he was a human.