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Former extreme ski world champion Guerlain Chicherit did what is called the first-ever unassisted backflip in a car. Strapped into a Mini Countryman, Guerlain had to maintain exactly 60kph and be full on the throttle on the ramp to land on all fours after a somersault.
Whatever. Porsche nailed this years go:
http://www.youtube.com/watch?v=wC–Oyn4oGY
And they didn’t even need a ramp.
Although unintentional, Mark Webber did it on two occasions at Le Mans in 1999 in his Mercedes. In fact one was a full 720.