The most stupid thing I did was to go at 133MPH with my ex police car a Chevy Caprice 2 doors equipped with a 350 4barrels TH350. The total weight of the car+me+my buddies+stocks in the trunk+fuel in the tank was 4975 pounds. The brakes stopped to work on the highway near a curve I was realy at 133mph. You will never see a Caprice drifting like that in your whole life :P
I regret it now cause thats the most stupid things I made.