We were on a two laned rd that we had never been on haulin ass. At the end of the rd is a round about and we came up on it really quickly...the supra started to fishtail and over corrected...ended up going over a big curb and into the grass. This all happened about 5 feet in front of me. I saw he was ok and took off where i was later caught. There were no other cars that i remember on our side of the rd