I'm pretty sure it hasn't happened, but I know a kid who spins like a top off rails (he's over-rotated 810s out of a shooter rail [kinda like a dragon rail, but just the up part, it's sick] - some people were having trouble with 4s out...), He's landed a 990 out of that rail, I was telling him to try more...granted they are all pencilled out, but they don't look forced or hucked too much.
That being said, it would be sick to see - but it wont look good or stylish by any means.