Here is an eyewitness account of the event:
"The apparent story is that the throttle stuck which from my point of view is correct. We watched him come from a main road onto the campus street. I believe he was just going to do a fly by sort of thing, but the car came around and did several spins (during the whole time the engine was at full bore) before hitting a curb and flipping over eventually landing upside down in the creek (the engine finally stopped lolz)".
Nuts and bolts right here.