Rally driving requires serious concentration on both the part of the driver and co-driver. If the co-driver reads stage notes wrong, or a driver doesn't react quickly, a crash and possible rollover is almost a given.
Many seasoned rally drivers have trained themselves to ignore the spectators along the sides of the stage, but one man distracts Mark Tapper in his prepared Mitsubishi Lancer in a most interesting way, by showing him his ass. The distraction is enough for Tapper to overshoot the next corner during the Rally New Zealand race and end up on his roof.
Amazing video at the link below.
More: How To Distract A Rally Driver, Braveheart Style