Via Thumper.

I'll bet that was a real rush. But when someone prone on a few roller skate wheels passes a motorcycle you know it's got to be a case of insufficient mylenation (another example can be found in the third paragraph here). Notice how he bleeds off speed by swerving side-to-side when coming up behind the motorcycle? I'll bet he doesn't have real brakes. It's still awesome:

Rollersuit in the Swiss Alps

Update: A friend of mine owns a roller skating rink. I asked him if he had ever done anything like this. He replied:

Joe, Back in the "GOOD'OL" days when all my knees worked I skated down 3 of the then MAJOR hills in Lewiston which were Fifth St. Grade, Eighth St. Grade and Twenty-first St. Grade, in Clarkston the biggie was Beachview Park Grade, the trouble with it was it ended in a parking lot with curbs a strip of grass, and the Snake River. It's a bitch to swim with roller skates on...............!  I passed a car on the Eighth ST. Grade deal he was doing 25 or 30 and he said I was still accelerating, but  I sure the first thing he did was let off so it seemed faster then he thought. We did clock the Twenty-first St deal and top was about 42 MPH-.......,use REALLY good Bearings

IIRC the way his knees stopped working was when he and his motorcycle parted company while they were both traveling at about 50 MPH. He tried running to avoid getting a road rash. His knees got messed up in addition to receiving numerous other injuries you might expect from a separation of man and machine of this type.